Could you please restart your primary machine, then try again to install the spacedesk.
If the same problem still persist, please send us the following for analysis:
– run dxdiag.exe on your primary machine, click „Save all information“ and send us the output file
– spacedeskSetup.log file located in C:\Users\Public
– setupapi.dev.log file located in C:\Windows\INF
Please save all requested files in one folder, then right-click -> Send to -> Compressed (zipped) folder, then attach the *.zip file on your next reply.