I don't play Sims on that computer since I got my laptop, so it's no biggie if it doesn't work. I may do some experimenting with the EA App on my desktop computer to see how the process works now.

I own the entire store and have all of the download files from the store copied to my external drive. I don't know if I can copy them into the EA App folder and have them work, but it's better to have them available just in am also interested in finding out if I can copy the files into the downloads directory and install them with the EA App launcher. I copied the entire Origin Games folder (45 GB!) to an external drive so I have access to all of the eleven EP folders as well as the six SPs I currently own. Right now, my Origin Games folder is still intact and contains The Sims 2 Ultimate Collection as well as The Sims 3 subfolders. I suspect that Master Suite, 70s 80s 90s Stuff, and Movie Stuff will not be available to me on the EA App because those three expansions were purchased on Steam and only registered on Origin using the key provided by Steam. However, if I click on View in Library, it goes to the Sims 3 page with the play button and there is no way to do anything further with it. I clicked on one I had purchased and get the description of the item. The ones I own say purchased in a green box at the top right corner of each one. I'm not going to take a chance purchasing the SPs I don't own until the EA App is bug-free. I just used the Search and put in The Sims 3.

If you want to purchase missing expansions or stuff packs, you have to go to the Origin store directly to do so. I only have 282 hours played now and I know it was well over 8,000 hours. Just checked Origin for Sims 3 and the tabs for Expansions and Stuff Packs are no longer on the page with the play button.

Sims 3 download manager