Could you post a screenshot of your game folder?
That's rather odd, the log you sent indicates that the endings_edit.rpyc file is missing, but it seems as though it's right there? I can't imagine what the problem could possibly be. I'm honestly as lost as you are...
The only thing I see that might be the problem is, it looks like you're in a different country (because of the language used with the file extensions) and honestly, I didn't think that would cause an issue, but maybe it did? I edited the American versions of the files after all?