Wow. I am totally impressed with Stardock's customer support. Within just a few hours, my problem was rectified. My software was found, my accounts were merged, and I am currently downloading Sins on Impulse. What a tremendous and hassle-free customer service experience. Too bad more companies don't respond like Stardock.
On a different note, but in the same vein: Being a longtime Steam user, I have to say that the slickness of the Impulse application makes Valve's buggy POS installer look like trash.
Anyway, I'm a very happy customer. Thanks again to the posters who helped.