About apk problem I've changed compressor behaviour so if there are none created signed apk after compression it's not deleting original (compressed but not signed) apk so for example if u had 1.apk and on ur Win11 and it fails to be signed (after compression) u'll just have same 1.apk but compressed and not signed (that u can try to sign manually until and if I'll fix the problem) but if imagine that u have Win10 and all went fine then u'll have apk named "1-aligned-debugSigned.apk" and that means all was fine (apk was compressed and signed).
You must be registered to see the links
so u need to unpack it somewhere, run "uber-apk-signer-1.2.1.bat" and make a screenshot of cmd window after process is done.
P.S. I've tried to compress apk on Win11 (build 21H2) and had no problems with getting signed apk files after compression with UAGC (both final test and test2 versions).
Regarding failing to launch if "pack unpacked files and folders back to rpa" unchecked all I can say that it's a very strange behaviour and I have no explanation for this coz I can understand if problem was with checked option but in ur case I've even can't blame Win11. Error log says about missing file "gui/window_icon.png" but it should be missing in both cases either u checked or unchecked "pack unpacked files and folders back to rpa" or exists also in both cases. I only could guess that u used different compression setting (and I'm not saying about quiality, it's most likely could be nconvert/pingo/libvips switches) or even different UAGC versions. Anyway I can't reproduce ur error on my Win10 coz game (Ravenous 0.083.preview) runs fine for me with this compression settings
View attachment 2107890
(didn't enabled audio/video just for faster testing coz problem was with images).