If you already have it in your EA App (formerly Origin) library, you’re in luck! You can still download and play it. If not, the game is no longer officially sold or distributed by EA. How to Get It Now (The Safe Way)
You actually have it easiest! The Sims 2: Super Collection (which includes most expansions) is still officially available for purchase and download on the Mac App Store. Essential Fixes for Modern PCs The Sims 2 Free Download
Most modern players turn to community-maintained versions like the "Sims 2 Starter Pack." These are pre-patched to handle modern resolutions and graphics cards. If you already have it in your EA