free download for the industry-standard SSL G-Master Buss Compressor can be tricky, as the premium versions by Solid State Logic
However, you can get it legitimately without breaking the bank: Official Demo : Waves offers a 7-day free trial of the full plugin through the Waves Central Frequent Sales
If you are looking for that classic SSL "push" and "glue," these are the safe, verified plugins you should download.
: If you are a Mac user, this native plugin is a direct emulation of the SSL G-Series hardware. FXpansion: SSL Buss Compressor (Free Version)