Do not install the game into Program Files (x86) . Windows security features in this folder can prevent the game from saving or reading mods.
The legal answer: No. Pirating a 10+ year old game is still piracy. EA no longer supports The Sims 3 actively, but technically it's copyright infringement. sims 3 ultimate collection dlcs elamigos
This collection typically features 21 pieces of additional content: 11 Expansion Packs : These add major gameplay mechanics and worlds, including World Adventures Late Night Generations Supernatural University Life Island Paradise Into the Future 9 Stuff Packs : Focused on furniture and fashion, such as High-End Loft Outdoor Living Master Suite Katy Perry’s Sweet Treats (often rare in newer official bundles), 70s, 80s, & 90s Movie Stuff Do not install the game into Program Files (x86)