Hi @janichols,
Can you please download the Microsoft Troubleshooter program here:
https://support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-removed-cca7d1b6-65a9-3d98-426b-e9f927e1eb4d
Run the “MicrosoftProgram_Install_and_Uninstall.meta.diagcab”, select Uninstalling.
If “spacedesk Windows DRIVER” is not on the program list, just select “Not Listed” then paste the product code of spacedesk_driver_Win_10_64_v0987_BETA.msi here: {CE7DC976-85B4-45B2-BDEB-A2C7B5BCA18F}
After that, please reboot your primary machine then try again to install the latest spacedesk msi installer from the website.
By the way, do you have third party antivirus software currently active on your primary machine?
