Solved it - there was an Event Log entry saying it couldn't start the Dell.TechHub.exe service, and couldn't find DotNet 5.0.0 (x64).  I did have several versions of 6 though!  It linked to: [URL] I downloaded and installed "Desktop Apps" (x64) and when I ran the installer, the Dell TechHub service was installed and started properly. I hope this helps
When opening SA today I was greeted with an update prompt. I went along with the update, however, it went no further than "downloading and starting up files", at which point the percentage bar went up to 100%, then gave me the error: "Installation failed - We were unable to complete the installation. Please reboot your PC and try again". I rebooted my PC and tried to update the application twice to no avail. I then tried to uninstall and reinstall SA, and the installer had the same issue - it gave me the same error message as the one that the application gave.  [IMAGE]I tried following this solution posted by [NAME], which included deleting some dell files and registry keys, to no use, unfortunately. Has anyone else encountered a similar issue or perhaps a possible solution? All help is appreciated.   
SupportAssist - installation failed message.