Targeted fixes (step-by-step)
If the driver is blocked because it lacks a digital signature, you must temporarily or permanently bypass this Windows check. Mastercam X7-2022 Virtual Usb Bus Error 39
Locate the specific GUID for your USB device (look for one containing "Universal Serial Bus controllers"). On the right pane, look for and LowerFilters . Right-click and Delete these values. Restart your PC. Additional Troubleshooting Steps Mastercam USB HASP issue - eMastercam.com Targeted fixes (step-by-step) If the driver is blocked
To avoid these errors in a professional environment, it is highly recommended to migrate to (CodeMeter). This eliminates the need for virtual USB buses or physical dongles entirely, removing the risk of "Error 39" during critical production windows. Right-click and Delete these values
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
If you are using older dongle-based versions, consult your local Mastercam reseller about migrating to modern software-based licensing (Activation Codes), which bypasses physical or virtual USB drivers entirely.