Yes, you're right. The latest versions don't work for me either. I haven't found a solution among plugins or settings. I made no technical changes on the PC between versions; only the file size increased due to new content. And on the JoiPlay Reddit, they write that some games are just not supported.
You should still try to play the split versions. I have made an automatic transfer of saves between versions, so the transition between versions will be effortless and lossless. Also, if you still have saves from JoiPlay, you can also transfer them. To do this, start the mobile version of the game to create a save folder. Then, transfer your old saves to the Android/Documents/WaifuSlutSchool/saves folder.