Files promising impossible compression levels are common vectors for malware, spyware, or ransomware. Corrupt Files:
If you own the game legally, you can install it onto a USB 3.0 flash drive (64 GB or 128 GB) and run it from there. This keeps your main hard drive free. Sims 3 Highly Compressed 100mb Download
While you cannot get the game down to 100MB, you can manage the game's actual footprint: Sims 3 || How TO Reduce Lag: Merging Custom Content (4) Sims 3 Highly Compressed 100mb Download
Once you've downloaded the Sims 3 Highly Compressed 100mb version, follow these steps to install and play the game: Sims 3 Highly Compressed 100mb Download