If you following the link about checking the update site, you can scroll down to get to the following section: KNIME Analytics Platform Installation Guide
There you can find the zipped update site for KNIME Analytics Platform Update Site, which you can then use as a local update site.
Ok, so the issue is resolved? For the other points, I would think that you might be sitting behind some proxy, but that is hard to tell without details or logs.
2024-05-02 15:25:02,496 : WARN : AWT-EventQueue-0 : : KCSExecutorNodeModel : SAP Table : 3:1 : KCSExecutorNodeDialog
2024-05-02 15:25:02,514 : WARN : AWT-EventQueue-0 : : KCSExecutorNodeModel : SAP Table : 3:1 : loadAdditionalSettingsFrom
2024-05-02 15:25:02,514 : WARN : AWT-EventQueue-0 : : KCSExecutorNodeModel : SAP Table : 3:1 : loadAdditionalSettingsFrom
2024-05-02 15:25:02,515 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:02.515] [000100] [W] [APIBase] [PrepareAndExecuteRequest] [KCS for HUB - xCS URL: http://localhost:5550]
2024-05-02 15:25:02,515 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:02.515] [000140] [W] [APIBase] [PrepareAndExecuteRequest] [Got xCS location. url: http://localhost:5550 kcsConfig.xcsHost: http://localhost:5550]
2024-05-02 15:25:03,532 : ERROR : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:03.532] [000100] [E] [KCSDialogHelper] [deleteAllKCSFiles] [File read write operation remained unsuccessful. KCS license could not be deteremined.]
2024-05-02 15:25:03,533 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:03.533] [000100] [W] [APIBase] [PrepareAndExecuteRequest] [KCS for HUB - xCS URL: http://localhost:5550]
2024-05-02 15:25:03,533 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:03.533] [000140] [W] [APIBase] [PrepareAndExecuteRequest] [Got xCS location. url: http://localhost:5550 kcsConfig.xcsHost: http://localhost:5550]
2024-05-02 15:25:04,560 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:04.56] [000100] [W] [APIBase] [PrepareAndExecuteRequest] [KCS for HUB - xCS URL: http://localhost:5550]
2024-05-02 15:25:04,561 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:04.561] [000140] [W] [APIBase] [PrepareAndExecuteRequest] [Got xCS location. url: http://localhost:5550 kcsConfig.xcsHost: http://localhost:5550]
2024-05-02 15:25:05,581 : ERROR : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:05.581] [000110] [E] [KCSDialogHelper] [getBrowserSettings] [API request to check if a default browser setting exists failed. Exception: [Cannot invoke “String.toString()” because the return value of “java.util.HashMap.get(Object)” is null]]
2024-05-02 15:25:46,358 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:46.358] [000100] [W] [APIBase] [PrepareAndExecuteRequest] [KCS for HUB - xCS URL: http://localhost:5550]
2024-05-02 15:25:46,359 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:46.359] [000140] [W] [APIBase] [PrepareAndExecuteRequest] [Got xCS location. url: http://localhost:5550 kcsConfig.xcsHost: http://localhost:5550]
2024-05-02 15:25:47,376 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:47.376] [000100] [W] [APIBase] [PrepareAndExecuteRequest] [KCS for HUB - xCS URL: http://localhost:5550]
2024-05-02 15:25:47,377 : WARN : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:47.377] [000140] [W] [APIBase] [PrepareAndExecuteRequest] [Got xCS location. url: http://localhost:5550 kcsConfig.xcsHost: http://localhost:5550]
2024-05-02 15:25:48,412 : ERROR : AWT-EventQueue-0 : : Utilities : SAP Table : 3:1 : [2024-05-02 15:25:48.412] [000110] [E] [KCSDialogHelper] [getBrowserSettings] [API request to check if a default browser setting exists failed. Exception: [Cannot invoke “String.toString()” because the return value of “java.util.HashMap.get(Object)” is null]]
2024-05-02 15:48:32,254 : WARN : comm-pool-thread-8 : : Node : DB Connector : 3:1 : Please select a database type.
2024-05-02 21:43:08,243 : WARN : main : : HubURIImporter : : : Hub request failed
jakarta.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://api.hub.knime.com/nodes/org.knime.sap.theobald.node.v2.SAPTheobaldReader2NodeFactory?details=full: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.apache.cxf.jaxrs.client.AbstractClient.checkClientException(AbstractClient.java:638)
at org.apache.cxf.jaxrs.client.AbstractClient.preProcessResult(AbstractClient.java:612)
at org.apache.cxf.jaxrs.client.WebClient.doResponse(WebClient.java:1149)
at org.apache.cxf.jaxrs.client.WebClient.doChainedInvocation(WebClient.java:1086)
at org.apache.cxf.jaxrs.client.WebClient.doInvoke(WebClient.java:931)
at org.apache.cxf.jaxrs.client.WebClient.doInvoke(WebClient.java:900)
at org.apache.cxf.jaxrs.client.WebClient.invoke(WebClient.java:363)
at org.apache.cxf.jaxrs.client.WebClient.get(WebClient.java:389)
at com.knime.explorer.server.internal.HubURIImporter.callHubApi(HubURIImporter.java:767)
at com.knime.explorer.server.internal.HubURIImporter.callHubApi(HubURIImporter.java:746)
at com.knime.explorer.server.internal.HubURIImporter.createNodeImport(HubURIImporter.java:562)
at org.knime.workbench.core.imports.URIImporter.createEntityImport(URIImporter.java:83)
at org.knime.workbench.core.imports.URIImporter.createEntityImport(URIImporter.java:105)
at org.knime.workbench.core.imports.URIImporterFinder.createEntityImportFor(URIImporterFinder.java:118)
at org.knime.ui.java.api.ImportURI.getEntityImportResult(ImportURI.java:163)
at org.knime.ui.java.api.ImportURI.importURI(ImportURI.java:133)
at org.knime.ui.java.browser.KnimeBrowserLocationListener.changing(KnimeBrowserLocationListener.java:89)
at com.equo.chromium.swt.internal.Chromium.lambda$18(Chromium.java:1354)
at com.equo.chromium.swt.internal.Chromium.syncExec(Chromium.java:3078)
at com.equo.chromium.swt.internal.Chromium.onBeforeBrowse(Chromium.java:1352)
at com.equo.chromium.swt.internal.Chromium.access$14(Chromium.java:1340)
at com.equo.chromium.swt.internal.Chromium$RequestHandler.onBeforeBrowse(Chromium.java:1179)
at org.cef.CefClient.onBeforeBrowse(CefClient.java:766)
at org.cef.CefApp.N_DoMessageLoopWork(Native Method)
at org.cef.CefApp.lambda$0(CefApp.java:328)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4029)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3645)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:643)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:550)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
at org.knime.product.rcp.KNIMEApplication.start(KNIMEApplication.java:204)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
Caused by: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://api.hub.knime.com/nodes/org.knime.sap.theobald.node.v2.SAPTheobaldReader2NodeFactory?details=full: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.mapException(HTTPConduit.java:1452)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1433)
at org.apache.cxf.io.AbstractWrappedOutputStream.close(AbstractWrappedOutputStream.java:77)
at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:56)
at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:717)
at org.apache.cxf.transport.http.HttpClientHTTPConduit.close(HttpClientHTTPConduit.java:112)
at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:63)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
at org.apache.cxf.jaxrs.client.AbstractClient.doRunInterceptorChain(AbstractClient.java:710)
at org.apache.cxf.jaxrs.client.WebClient.doChainedInvocation(WebClient.java:1085)
… 46 more
Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.base/java.net.HttpURLConnection.getResponseCode(Unknown Source)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
at org.apache.cxf.transport.http.URLConnectionHTTPConduit$URLConnectionWrappedOutputStream$2.run(URLConnectionHTTPConduit.java:370)
at org.apache.cxf.transport.http.URLConnectionHTTPConduit$URLConnectionWrappedOutputStream$2.run(URLConnectionHTTPConduit.java:366)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at org.apache.cxf.transport.http.URLConnectionHTTPConduit$URLConnectionWrappedOutputStream.getResponseCode(URLConnectionHTTPConduit.java:366)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.processRetransmit(HTTPConduit.java:1503)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleRetransmits(HTTPConduit.java:1490)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:1621)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1420)
… 54 more
Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/sun.security.ssl.Alert.createSSLException(Unknown Source)
at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)
at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)
at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)
at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.checkServerCerts(Unknown Source)
at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.onConsumeCertificate(Unknown Source)
at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.consume(Unknown Source)
at java.base/sun.security.ssl.SSLHandshake.consume(Unknown Source)
at java.base/sun.security.ssl.HandshakeContext.dispatch(Unknown Source)
at java.base/sun.security.ssl.HandshakeContext.dispatch(Unknown Source)
at java.base/sun.security.ssl.TransportContext.dispatch(Unknown Source)
at java.base/sun.security.ssl.SSLTransport.decode(Unknown Source)
at java.base/sun.security.ssl.SSLSocketImpl.decode(Unknown Source)
at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(Unknown Source)
at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getHeaderFields(Unknown Source)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getHeaderFields(Unknown Source)
at org.apache.cxf.transport.http.Headers.readFromConnection(Headers.java:280)
at org.apache.cxf.transport.http.URLConnectionHTTPConduit$URLConnectionWrappedOutputStream.updateCookiesBeforeRetransmit(URLConnectionHTTPConduit.java:330)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleRetransmits(HTTPConduit.java:1488)
… 56 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/sun.security.validator.PKIXValidator.doBuild(Unknown Source)
at java.base/sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
at java.base/sun.security.validator.Validator.validate(Unknown Source)
at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
at org.knime.core.util.KNIMEX509TrustManager.checkServerTrusted(KNIMEX509TrustManager.java:109)
… 77 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.base/java.security.cert.CertPathBuilder.build(Unknown Source)
… 83 more
2024-05-02 21:54:41,247 : WARN : ModalContext : : Node : Missing Value : 4:379:375 : Column “Email” still contains missing values.
Column “CorporateEmail” still contains missing values.
2024-05-02 21:54:41,435 : WARN : ModalContext : : Node : Missing Value : 4:312 : Column “CorporateEmail” still contains missing values.
Column “Email” still contains missing values.
2024-05-02 21:54:41,838 : WARN : ModalContext : : Node : Bar Chart : 4:327 : There are rows with missing values in one of the selected frequency columns. These frequencies are not displayed for this row.
Caused by: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://api.hub.knime.com/nodes/org.knime.sap.theobald.node.v2.SAPTheobaldReader2NodeFactory?details=full: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
PKIX path building failed errors can be resolved following this thread. If I see that correctly, than the first option is following the linked video and the other one might be faster with altering your knime.ini file: