The latest software release for Soundcraft Realtime Rack is UAD v8.6.3 (available here). UAD v8.6.3 is compatible with Mac OS X 10.11 El Capitan and macOS 10.12 Sierra. 

The previous software release for Soundcraft Realtime Rack was UAD v7.4.3 (available here). UAD v7.4.3 is only compatible with Mac OS X 10.9 Mavericks. 

To visit the UAD Software Downloads page, click here.