If you have an older Mac running Mojave or earlier, you can find the Legacy M-Audio Drivers
No official drivers exist. The USB port on the keyboard will likely only provide power, not data. 2. The Universal "No-Driver" Workaround
Support ended with macOS 10.8 (Mountain Lion) .
For 80% of users who just need a simple keyboard to play virtual instruments, However, for those who bought the Radium specifically for its hands-on controller surface, you need a workaround.
If you are on a recent macOS version or an Apple Silicon (M1/M2/M3) Mac, the legacy drivers will not install or run. Use these alternatives: