If the above steps don't resolve the issue, you may need to perform more advanced troubleshooting:
echo Creating and starting service... sc create multikey type=kernel start=auto binPath=C:\Windows\System32\drivers\multikey.sys sc start multikey
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If the installer runs but Device Manager shows no Multikey:
Mastercam needs explicit registry entries to locate the emulated hardware ID. Press Win + R , type regedit , and hit . If the above steps don't resolve the issue,
If Test Mode didn't work, or if you want a more permanent solution without Test Mode, you can try a more aggressive approach: permanently disabling driver signature enforcement.
error or the software failing to launch despite the process appearing in Task Manager If you share with third parties, their policies apply
Specifically codes -3, 7, and 39 are common when the MultiKey driver fails to load.