now i gotta play the whole thing again

hi wanted to play again the first game of bendy for a stream but it doesnt work anymore. when im trying to play it says: Bendy and the Ink Machine An error occurred while launching this game: Missing game executable - D:\SteamLibrary\steamapps\common\Bendy and the Ink Machine\Bendy and the Ink Machine.exe why? somebody has the same problem? i bought it some years ago and i really dont want to lose it...

For some reason the achievement called "bathe in violence" is glitched for me like I survive the hole fight against the ink monsters and dose not pop up please help.

Recently I played Bendy (chapter 3) and when i rejoined to continue my save the elevator didn't work for some reason (the elevator buttons,door wouldn't open blah blah blah) is there any way to fix it?

I'm just a bit curious about that bc I've been thinking about it and tried it a few times