Resolved...well it took several steps...had to manually search and delete any Microsoft Flight Simulator entry in the registry related specifically to fsx.exe. This allowed the Remove to work from...

I have tried different compatibility settings...if I try a repair I get Error 1605: action only valid for installed products. and if I try the Remove I get "Failed to load DLL: GameuxInstallHelper. ...

My update to 1607 went smoothly yesterday...deferred for quite while...had to reinstall DisplayLink driver as expected. Started testing various apps. Found out that the update deactivated FSX Gold...