Update: I downloaded the most recent nighty build and the very same issue of not being able to start Knime appeared again.
!SESSION 2023-08-11 12:53:58.416 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_371
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_GB
Command-line arguments: -os win32 -ws win32 -arch x86_64
!ENTRY org.eclipse.equinox.simpleconfigurator 4 0 2023-08-11 12:53:58.926
!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.BundleException: Could not resolve module: org.eclipse.equinox.simpleconfigurator [2]
Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=11))"
1691751238524.bak_0.log (1018.2 KB)
1691751238524.log (625.2 KB)