If Error 39 points directly to the Virtual USB Bus (not the dongle itself), the bus driver is corrupted.
Error 39 on the Virtual USB Bus is stubborn but not fatal. If none of the above works:
Final note: If you are using a cracked or emulated “Virtual USB Bus” (non-genuine key), Error 39 is often intentional—Microsoft’s security updates actively block many legacy emulators. In that case, the only reliable fix is moving to a legitimate Mastercam license.
Have you beaten Error 39 with another method? Share your experience in the comments below. Mastercam X7-2022 Virtual Usb Bus Error 39
| Factor | Impact | |--------|--------| | Windows 10/11 security hardening | Driver signature enforcement is stricter after 2020. | | Lack of emulator updates | Most emulators were last updated for Mastercam 2018/2019. | | No official support | Mastercam will not help; error is from a non‑authentic setup. | | Community fixes are fragile | Solutions often break after a Windows update. |
⚠️ Note: Discussing or supporting software cracks may violate laws and Mastercam’s EULA. The steps below are for educational understanding only.
If the driver installs but still shows Error 39, Windows may be blocking an unsigned driver. If Error 39 points directly to the Virtual
Note: This is a diagnostic step, not a permanent solution.
Before you dive into fixes, confirm you actually have Error 39. You will see:
Do not let Windows auto-install the driver. Do this manually: Final note: If you are using a cracked
For Mastercam X7–2022, use driver version 7.90 or 8.31 (newer versions can also work, but test carefully).
Before applying a fix, the system state must be verified.