@ARP1922 The Sims 2 has had a rocky start on EA App. Although it shows up as The Sims 2 Double Deluxe, it should still, technically, be Ultimate Collection. I have previously installed Ultimate Collection from Origin and it matched (for the lack of a better word), or I should say "recognized" The Sims 2 (Double Deluxe) in EA App.
Now here is when issues start. To test things out, I had uninstalled Ultimate Collection in order to download it directly through EA App. It always threw an error. When I reinstalled through Origin, it matched to TS2 in EA app again.
I would like to ask that you try to download The Sims 2 through EA App (you don't need to finish the download, just attempt to start it) and let me know what happens. Does it give you a download link to The Sims 2 Store Edition (as a ZIP file), or does it actually download Ultimate Collection inside EA App? Also, does it list your game's product code or say No Code Required?
I am asking this as at least one other player I had talked to somehow got Store Edition instead of Ultimate Collection, so I am thinking that this might be the problem as to why some players can't download it. For comparison, I do not own Store Edition on Origin, which is (I suspect) why I get the download error.