kith101: This happens a lot when you purchase one game using one email address, and the other with a different email address, often times PayPal is involved. If this is your case, you can merge the two accounts together here: https://www.stardock.com/support/registrations/
deslocc124: This is often times caused by antivirus software getting in the way of the download. Try adding exceptions or temporarily disabling your security software and see if the issues persist.
In either case, if you're still having issues, feel free to drop support@stardock.com a line, and we'll get you taken care of.