I saw this similar (closed) thread and a couple others but they all end the same way (“success!”), my attempts do not .
I do all the steps (including invoking a higher power ), and I’m still stuck.
When I click File - Install KNIME Extensions nothing happens. There’s no progress bar in the lower right of the KNIME window, no pop-up, no new window. Bupkis.
I tried unzipping each of the three zips (updates, community, and partners) into their own subfolders and pointing the “Available Software Sites” to the extracted content.jar files, and unchecked all the URLs and still nothing.