On which part of the setup did it get stuck? What was shown in the installer window?
FYI: If you already see the Repair or Remove option, it means spacedesk installation was able to finish.
For further analysis, could you please send us the following:
– 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 in your next reply.