Re: [Existing Game Files] How to use?

@aFatLilGoat  No, the EA App doesn't have Origin's Locate Game feature, at least not now.  What you can try though is setting the App to download to the same location where a given game is already installed.  When I've tried this, the App has usually just verified the existing files and finalized the install, although I did see it redownload a couple of Sims 4 packs in their entirety.

The other cause of the "you don't have access" error is a temporary hiccup with the App, which can usually be cleared up with an App Recovery:

https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/

I'm not saying this will help here—reinstalling Windows means you wiped the registry entries that the App needs to verify your ownership, which is the cause of your current issue.  I'm just mentioning it in case you run into the problem again down the line.