Please help with technical issues, Sims 2 Ultimate Collection

(Sims 2 ultimate collection) Hello! I would die for sims 2, I bought computer parts so that my brother could build a new computer since EA Games now won’t update on windows 7. Now I have a new computer with windows 11.

I have CC and mods from when I was 12 and I’m 25 now, so at first I just copied everything to the new folder but that didn’t work so I only copied neighbors hoods and downloads. That worked better, but then I changed graphics rules to get screen resolution and smooth corners. I also changed the camera with the GunMod.It worked fine as well but then my game crashed everytime I opened a lot, even a MAXIS family. So I cleared out some downloads, and I separated them into groups and added each one and then I could load a lot. Everthing finally worked UNTIL IT DIDN’T!!! The school bus came, it crashed. Someone called the phone, it crashed. Someone came home from work, it crashed. Someone got point for cooking, it crashed. So I took every mod I had (I think Bcs I have a lot of package files named 7e65gnj6363 for example) and the same thing happened. It just crashes randomly?  Before I changed the graphics rules I also downloaded the program that does it automatically but that didn’t work.

I’ve been sitting in front of my new computer for 9 hours. I feel like I tried everything? I don’t want to remove all my CC and mods Bcs I have saved up for years and years, I’m just an idiot for not dividing them … I only bought this new computer to play sims 2!!! Is there something I’m missing? 🌟 thanks in advance!