If you are looking for a compressor that stays on your system forever without paying a dime, there are excellent freeware alternatives that compete with the CLA-76:
You're looking for a free download of the Waves CLA-76 compressor plugin!
Analog Obsession (via Patreon, but often free) makes a plugin called FetSnap. It is explicitly designed to emulate the FET compressor sound. It offers the famous "all-buttons-in" mode and sounds shockingly close to the CLA-76.
