[hayend]

I am trying the uninstall, Rclean, reboot and reinstall method now to see if it works. For me ISTA was failing at the fault scan process and gave me the error. When I then go to software update, it says the vehicle test was not carried out. Because it has an error when doing the vehicle test even though it completes and shows faults.

Maybe mixed versions?

I always do full uninstall of existing stand alone version. Then install new version. Never do any cleaning and have never had issue. So it is surprising to have the issue. Maybe I need to re download all the files again. I check file size of download vs mega. Seems the same. Not like it is missing any. Install location also same as all previous versions.

You and I only talk about problems with the new version. So far, I have not encountered any reinstallation errors while installing ISTA.