...I've purchased the full program along with the "Extended Download Service." The thing is that the downloaded file including the serial number "was" on my external hard drive, but my HD messed up (conked out), and I had to buy a new one. All of the info I had is gone. Whomever within the Matrix Staff can help with my situation it'll be appreciate.
Also it may not hurt to burn the install program with a notepad copy of your serial to cd. That's what I generally do with any game I download. Whether its from here or Direct2Drive or any other site. Call me old fashion but I like having a hard copy.