I bought and played with a game pack, but now the sims 4 says I don't own it.

chickenfordiner​  Is this still an issue?  If so, please clear the EA App's cache:

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

and repair the game: EA App > Sims 4 > Manage > Repair.

If that doesn't help, please run a search for the folder for Cottage Living.  Open a File Explorer window, click This PC in the left panel, and enter EP11 in the search field in the upper-right corner.  Wait for the search to finish, then make sure the full file path is showing under each result.  If it's not, expand the window sideways as necessary.  Take a screenshot using Windows key-shift-S and attach it to a reply here.