Can't launch old version while have new one installed

Hi there

For workflows design I use new version 5.2.3, but our server is deployed in 4.6.4, thus to schedule the workflows I asked to provide files in 4.6.4 version.

Previously to do that I just opened the workflow in 4.6.4 and saved. I don’t know if this happened after recent update, but now 4.6.4 doesn’t launch. I had 4.6.4 downloaded as archive and simply used knime.exe from the folder, but now it just doesn’t work and neither I can’t instal 4.6.4 - requires to delete 5.2.3.

Any thoughts?