Had the same problem with version 6.4 build 73 but it was fixed by following DrJBHL's advice in reply #1 in this post: https://forums.stardock.com/366907 HTH. I think StarDock needs to work on this or potential buyers will be driven away.
The Dr. hit a bullseye as far as fixing the "expired" problem. I'm running the 30 day trial now after uninstalling with Revo Uninstaller and using the link at the StarDock site to download the version that's running now (6.4 Build 73). Unfortunately, I've got problems when I run it, but they don't belong in this thread.
I'm running XP Pro SP3 totally up to date. I wanted to do a 30 day evaluation of WindowBlinds so I could compare it with StyleXP and the Windows Customization features of TuneUp and decide which to buy. I downloaded WindowBlinds640_public.exe from filehippo.com and installed it. When I tried to run it, I got the error dialog box which reads "This version of Stardock WindowBlinds has expired. Please download the latest version from www.stardock.com" Clicking the OK button takes me to a WindowB