You can download Windows VM from https://developer.microsoft.com/en-us/windows/downloads/virtual-machines/.
After importing OVA, to run it, you need to change Display settings to be:
- Graphics Controller: VBoxVGA
- Disable
Enable 3D Acceleration
Otherwise you'll enter a boot-loop.
Maybe this is just a NixOS thing.
The VM will expire eventually you'll need to redownload a new machine each time.