Hmm, I'm not sure but I think Techstar recompiled those builds, which may be relevant. If there is an issue with non-ASCII filenames it wouldn't surprise me, I haven't done any testing of that. Most games stick to ASCII but I know there are some that don't(some Russian games, notably).
What kind of issues did you run into and how were you tipped off to this?
Edit:
Interesting... I downloaded the linux version of that compressed release and I found the filenames differed after I recompiled.
View attachment 1191842
The window on the left is Techstar's release as it appears when I extract it with 7zip, the window on the right is after recompiling with the RenPy SDK and extracting with 7zip again. The filename format differs and upon trying to compress with file explorer I get this:
View attachment 1191849
So perhaps
Techstar didn't recompile?
Try downloading this and let me know if the names are correct:
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