Re: Sims 4 Cats and Dogs pack not working
@Soldier_Adams What you found in OneDrive is the Sims 4 user folder, which contains saves and other user content. If the EA App did somehow install an expansion into this folder, the game wouldn't be able to use the data anyway.
And yes, the fact that you can use each others' saves is definitely because of OneDrive syncing the local files with cloud storage, then downloading them to all computers signed into this particular Microsoft account. In your position, I wouldn't want OneDrive to sync anything, but perhaps you have a use for it. If not, let me know, and I can describe how to stop the syncing from happening.
If you click Sims 4 in your game library, then click Manage, then Manage add-ons, is Cats & Dogs on the list? If so, you should see a Download button. At least, that's what I see on my laptop now that I have the game installed there, and the download did start when I clicked the button.
If that doesn't help, try using the App Recovery option, which is in the dropdown menu in the upper-left corner, in the Help category.
If this doesn't work either, please contact EA customer support to make sure that the purchase did in fact go through.