Re: Error Code 00000008:ffffffffffffffff
@TheSaturday6 Just so you know, the Sims Delivery content is always incorporated into a later patch, so you're only missing the items for a short amount of time. I know that's not a real answer; I'm just saying the problem doesn't always have a practical effect.
For the problem itself, try running Origin and Sims 4 as an admin: right-click on each shortcut and select "Run as administrator." I take it when you did "the rename thing," that means you renamed the Sims 4 folder in Documents\Electronic Arts, but if you haven't, please do so now.
If running Origin and Sims 4 as an admin doesn't help, I'm curious whether you'd see any difference in a new admin Windows account. Since Sims Delivery content is initially downloaded into the user folder in Documents, you might have a permissions issue with that folder, and a new admin account means a new Documents directory. I'm not suggesting you abandon your current user account, only that this is a useful test.