https://www.nexusmods.com/baldursgate3/mods/652?tab=description
Said in the description to drop in the data folder..
Even if that is incorrect. I dont get why this data mismatch error happened. Especially after i deleted the mod file.

I did search where the save folder is located...
Thats why i asked. I thought it wasnt there for me. Just realized i glanced over local...so i only checked appdata/larianstudios. So yeah, my bad, they are there. Ty anyway.