Here is another fix if you don't want to uninstall Windows updates. The problem is that the latest Windows updates invalidate the certificate of the MulttKey driver. We can verify this by opening the Device Manager, in the core, we will find a previously created virtual device with an exclamation mark. We need to make sure that the certificate passes Windows validation. I did this:
1. In the Driver Signature Enforcement Overrider (DSEO) program, I selected Sign a System File (Run program As Administrator and make sure UAC is off)
2. Entered the path to the driver C:\Windows\System32\drivers\MulttKey.sys
3. Click OK
4. Turn on test mode in Windows. To do this, just start the command line (Powershell) from the Administrator and enter the command: bcdedit -set TESTSIGNING ON
5. Reboot the system.
6. Now everything is OK. MasterCam should work.
But we see an inscription in the left corner of the screen that Windows is in test mode. If you find it annoying, you can remove this inscription using the Universal Watermark Disabler program.
Link to the programs:
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