al6xis Please open the EA App and click Sims 4 > Manage > Manage add-ons. Does Cats & Dogs show as installed? If you see a Download button, click it.
If C&D is listed as installed, please run a search for its folder. Open a File Explorer window, click This PC in the left panel, and enter EP04 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.