You need to stop all this installing/un-installing, trials, paid versions, etc.
You installed Impulse. Good. Did you create your account using the same email that you ordered Windowblinds from originally?
If not, then you need to merge accounts.
Do that here: https://www.stardock.com/support/registrations/
Source account: The one you created NOT with the original ordering email.
Destination account: The one you DID order your original windowblinds from.
After that is done, and the un-installation of however many installations of windowblinds you have on your machine is done (and I recommend you do this with ccleaner, as well as removing all windowblinds registry keys with the registry tool in ccleaner - which is free on the web at http://www.piriform.com/ccleaner/download use the links at the bottom of the gray box (Filehippo)), reboot.
Then, logon to Impulse with your Destination account email and password. You should find Windowblind "available for download" in the "My Software" tab.
If it isn't, let us know on this thread.