Hello!
First, I tried the “drag and drop” method to install the “Indigo KNIME integration” extension, however I received the following error:
“Could not query updates site for missing extensions
HTTP Server ‘Internal Error’: https://hub.knime.com/epam-lsop/extensions/com.epam.indigo.knime.feature/latest/content.xml
HttpComponents connection error response code 500.”
Then I tried another way. I added link with extension to File > Preferences > Install/Update > Available Software Sites. But further attempt to install via File > Install KNIME Extensions... also failed.