Some troubleshooting I discovered: Make sure you switch to 256 colors before attempting to launch, or it might crash. If it says your Wagon Config is not valid (can happen after a crash) copy it again from the image. If you get "Unable to open AppleTalk socket", reboot, then make sure AppleTalk is enabled and connected, make sure you're on 256 color mode, get a fresh copy of Wagon Config, and try again.

I have this working on my 512Ke with 2MB RAM upgrade on System 6.0.8, my G4 Cube on 9.2.2, and several machines in between. It just needs AppleTalk and 1000KB free memory.
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Management Password: bang