In the right pane, look for or LowerFilters and Delete them. Restart your computer. Troubleshooting Additional Causes Mastercam USB HASP issue - eMastercam.com
For over a decade, Mastercam users relying on (Network Hardware Security Key) or Virtual HASP emulators have encountered a maddening roadblock: "Error 39: Windows cannot load the device driver for this hardware. The driver may be corrupted or missing." mastercam+x72022+virtual+usb+bus+error+39+fixed
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters . Right-click and select your system. Driver Refresh Steps In the right pane, look for or LowerFilters and Delete them
This thorough guide details why this licensing blocker happens and provides exactly how to permanently fix it on modern Windows environments. What Causes the Virtual USB Bus Error 39? In the right pane
Once fixed, take these steps to avoid recurrence: