The installer runs on my laptop with Windows 7 Home Edition and a newer Razr 4K laptop with Windows 10 Home edition. The workstation I am having problems with runs Windows 7 Professional with SP1. Could that be the difference? I can see the two popup windows quickly flash on the screen in all cases, but the agree to terms and conditions window never comes up on the workstation. Under Task Manager, I can see the installer process sitting inactive, consuming no CPU. Could it be waiting for some response from me that I don't know about? The workstation is fairly clean. I run mostly Pixinsight and some Photoshop on it, since it is dedicated to astroimage processing.