I read that @d-pupp asked for a download link on top of the page. So:
Download page for the latest 9.3.x series is
https://vanilla-dpup.github.io/
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I installed (frugal) the 9.3.1 (x64) version without the 9.2.x savefolder.
Everything went well. No issues here. New savefolder for 9.3.x
I use NotecasePro (registered) on every system I use. Also installed okay.
Firefox and Palemoon: I just use the tarballs and unpack them to the /opt folder. Also no problem.
So far so good.
Keep it going.
Thanks!