Re: Expansion pack on multiple computers?

Yes you can. Only you can't play on both devices at the same time, which is the same with base game.

To find you packs, follow these steps:
- Go to 'Game Library' in Origin
- Right click 'The Sims 4' and choose 'Game Details
A overlay moves in
- Have a look under the 'Extra Content' tab
That's where all your Game Pack, Stuff packs and expansions packs should show up.