Downgrade to Ren'Py 7.3.5? It's possible though I haven't done extensive testing with it.
https://f95zone.to/threads/corrupted-kingdoms-v0-9-4-arcgames.31912/post-5332821
The scripts have to be re-compiled for 7.3.5 but I do that with the unofficial update for compatibility
https://f95zone.to/threads/corrupted-kingdoms-v0-9-4-arcgames.31912/post-5426072
Though if you wanted to see if the Ren'Py Nightly Build 2021-03-28 is improving I got that too
https://f95zone.to/threads/corrupted-kingdoms-v0-9-4-arcgames.31912/post-5426464
I think Ren'Py 7.4 adds information to the save data which may cause errors like
Code:
AttributeError: 'TransformState' object has no attribute 'size'
Just trying to load save game data from 7.3.5 with the Nightly Build, saving it in that, and loading it back into 7.3.5 seems to work fine under light testing. Didn't really monkey much with trying to get Android to work with 7.4 since when compiling the engine decided to eat 60 GB+ and I wanted that space for more porn so didn't continue after it told me it filled up the drive I was testing it on... The only thing that prevents using 7.3.5 is maybe filtering out some extra data that was attached to a save made with 7.4.
Now for all the new devs out there this is why when companies have Engine X they stick to that instead of upgrading as all the previously tested code would have to be retested otherwise
As for right now I assume Arc, along with the other devs that thought joining the lemmings death march looked cool, is hoping Ren'Py Tom will save them... Not something I would have bet my lively hood on since 7.4 has been riddled with problems but some believe in spray & pray.
Fun Fact: If you been using the Unofficial Updates before 0.9.X well you are still using Ren'Py 7.3.5 since I've been recompiling the scripts using that for compatibility reasons