I tried the installation in my company network, with active proxy settings (that allowed me to install other extensions) and also from home without any VPN or proxy connections. I always get this error.
Okay, now I feel stupid. I just triggered the installation again to make sure it had the most recent entries in the log file, and it worked. So, it might be proxy-related.
I’m on KNIME 5.2.3, and I could not find a create_env.err nor a create_env.out in the log folder.