The virtual USB bus is required for Mastercam X7 2022 because it allows the software to communicate with the dongle or hardware key, which is necessary for:
A virtual USB bus is a software-emulated USB connection that allows a computer to communicate with a device as if it were a physical USB device. In the context of Mastercam X7 2022, the virtual USB bus is used to connect the software to a dongle or a hardware key, which is required for licensing and authentication. mastercam x72022 virtual usb bus install
Attempting to install the Virtual USB Bus driver without preparation is a recipe for the infamous (Device not found) or Error 2 (NethASP not responding). The virtual USB bus is required for Mastercam