Re: EA App works but mods and cc don't.
1) Try downloading the content through Origin instead. (The EA App still has some issues.) You can install Origin using the link here:
It's fine to have both apps installed on your computer; you just can't run them at the same time.
2) I wouldn't worry about it at this point. If you run into an issue that seems related to the game's program files, we can address it then.
3) It sounds like the game is reading a different Sims 4 user folder than the one where you've added the mods and custom content. So please use this in-game method to find your user folder:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
That's the location where you need to add your mods and custom content. If that doesn't help, please post the file path you see there. It's fine to write [username] rather than your actual username, but leave the rest of the file path intact, and let me know if you see the wrong username, i.e. not the one associated with your Windows account.
Having an unrecognized graphics card doesn't have anything to do with the other issues. However, you should only have seen the message the first time you launched the game. The fact that you're seeing it repeatedly suggests that the file that stores this info is getting deleted or reset. The the location of your user folder should clarify things.