The error message in your screenshot indicates that a display hook driver is present on your system.
Display hook drivers are not standard Windows drivers.
All products relying on such drivers are incompatible with each other.
They cannot coexist on the same system. This includes spacedesk.
In your case, which one of the software below is currently installed in your primary machine?
- Duet display
- Fresco Logic
If one of the these software is present on your system, please uninstall it then reboot your machine.
After that spacedesk should work now on your machine.