I tried that right from the start following the instructions (xx). When I try to install one of the drivers under Android - Google, a warning appears: “It is not recommended to install this device driver because it cannot be confirmed that it is compatible with the existing hardware components. If the driver is incompatible, the hardware component may not work properly.”
I didn’t want to risk that for a flash process.
The driver under Android - Google - Bootloader seems to work, though.
However, for testing purposes, I only installed the driver and tested the communication with “fastboot devices”.