The game was deleted after the update.

That’s really frustrating to hear — losing your game or saves after an update is something a lot of Sims players have unfortunately run into. When Sims 4 “disappears” from your EA App but is still owned, it’s often not really deleted; it’s usually an install/visibility glitch with the EA App or a corrupted install after a patch. One thing many players recommend is clearing the EA App cache and then repairing the Sims 4 install through the app — that can sometimes make the game reappear properly instead of showing a “download” button again. Another tip is to check your Documents > Electronic Arts > The Sims 4 folder and make sure your save files are still there (and not moved into a cloud/OneDrive folder), then restore them if needed. A fresh install after clearing cache and repairing often fixes weird launch issues, so it’s worth trying before assuming the game or packs are gone for good.