Hey,
I am also having the same problem. Elements 8 and it says on the website that it is compatible Elements 8. I install it. It says the installation was successful but only leads me to there website to purchase it when i try to save as MP3.
Was this resolved?
So annoying 
EDIT: I figured it out, if you are having the same problem. You need the registration code sent in the receipt email from steinberg . Open the eLCC control center, select the “actions” dropdown, and “enter activation code”. Type in the code from your receipt email and it will load. Then it should work.