We are aware of the issue with the support page. The team has been notified. If you email support@stardock.com your case will be created.
Ah, so that's what that check box does.... 
This should be back up now, with all new departments!
Go to Start> Run.. in XP or Start>Start Search in Vista, type "regedit" and hit enter. Navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Stardock\ObjectDesktop\WindowBlinds
You'll want to make sure it is set to the following path:
32 Bit: C:\Program Files\Stardock\Object Desktop\WindowBlinds
64 Bit: C:\Program Files (x86)\Stardock\Object Desktop\WindowBlinds
(NOTE: If you installed WindowBlinds to a different directory, replace the above default one with your custom location)
If the path was incorrect, change it and then reboot.
If it is in fact pointing to this path, please try the following:
-Launch Impulse. Right click on the entry for WindowBlinds and choose "Verify application"
-Impulse will check the integrity of the installed application. You should be given feedback as to the state of the installed application.
-If errors are found, an update should be made available in Impulse. You'll need to select another application and then reselect WindowBlinds to run the update.
(NOTE: This is a UI bug in Impulse, that should be fixed in a future update)
-Once the update completes, reboot your PC.