The latest software release for UAD-2 Live Rack and Realtime Rack is UAD v9.4.2b (available here). UAD v9.4.2b is qualified with macOS 10.13 High Sierra.
Note: UAD v9.4.2b software is fully compatible with both Soundcraft Realtime Rack and UAD-2 Live Rack.
The previous software release for Soundcraft Realtime Rack was UAD v8.6.3 (available here). UAD v8.6.3 is only compatible with Mac OS X 10.11 El Capitan and macOS 10.12 Sierra.
To visit the UAD Software Downloads page, click here.