Leo 6.4b3 is available here.
It installed and ran normally. I did see a message on the console: cleaning C:/Users/tom/.leo/spellpyx.txt. That bothered me, but when I look at the file it still had the words I remembered entering. What is this "cleaning" supposed to do? If it isn't removing my added words I'd rather not see it at all.
Worked w/o any issues in a Fedora 33 VM w/i qubes OS R4.0
Thanks a lot for also testing the PyPI variant for Leo up front !
I just installed from Pypi into a brand new Debian V11 VM and there were no hitches.I did have trouble on my older Debian V10.10 VM - I couldn't get Leo to run, neither the older 6.3 nor the new 6.4b3. It is some problem in the Qt libraries.