The trial version I think will allow you to upgrade to the full retail version.
Well, I wish it were that easy. Adobe, and Microsoft have both figured out ways to keep their products secured from the hands of pirates and still use the trial with a key sent to you by email after payment, but you can't upgrade the trial to the full version of WindowBlinds or the other Stardock products. Neither will CCleaner uninstall WB. Stardock developed a piece of software called Impulse in it's later years. It's required, it appears, to use Impulse to uninstall the WB trial.
In April of this year, Stardock surprised a lot of the gaming world when they sold it to GameStop, a giant gaming distributor who now own a way to distribute their games and game updates, but also to help make those games more secure on the web. GameStop users are up in arms; they're worried that small independent games will be smothered out of the market & that GameStop can raise the price of game distribution to new all time highs. I'm not saying it's all as simple as that synopsis, but after several hours of trying to find out how to uninstall WB, that's the gist of what I learned. I have yet to learn where I can download it. It's still freeware, I hear.
When I find that link if someone hasn't already posted it, I'll post that link here to make it easier for someone else to find.