Ugh, I purchased a second copy, and through all the confusion (yes, I'm not too bright but I do hold a degree and have been gainfully employed in IT for nearly 20 years). Now I own two copies under the same Impulse account. I can't transfer the second, I can't un-register it, etc.
I did not try to do it this way. During the purchasing prcoess, I did use a second email account! But I guess I did it wrong.
Frankly, in hindsight, I may have made a mistake. But it should NOT be this hard to spend more money on Stardock games.