I had a problem with support assist not running so uninstalled it, downloaded the latest version (according to the installer its 4.3.0.52594) and am trying to install it but it does nothing other than showing the initials screen and then exits. on another run its stays with the initial screen and does not do anything else. left running for over 15 minutes.

No event logs. sfc scan showed nothing. system restarted. same problem. system boot diagnostics all good.

This system in no longer under full support but I am expecting the software to be supported. Am I being stupid?