The following is my input to SW about my update experience.

When I tapped the SW icon in the system tray to open SW 3DEXPERIENCE, I was greeted by a pop indicating that I had Hotfix 1 and needed to update to 2.6. For most apps that would have been a simple task that perhaps would require a restart. I tried multiple times that always ended with error code 1603. In an attempt to get a fresh installation, I tried to have Windows uninstall SW but that failed. I also tried the SW-specific uninstall batch program but that failed too. I don't have time for Dassault's abuse and fortunately have alternatives. So, I quit!