I had the latest version of Zemana Anti-logger installed, it would not except the key. So I uninstalled it, installed the older version from the link the promo provided, and it still did not accept the key. Luckily I made a system restore point before doing this so I was able to restore my system back and my old key was working again. I wanted the new key to work because it would've extended my license substantially, but the key simply did not work on either the new version or version they gave you a link to.
On a side note, I re-registered for the promo with a different e-mail, they sent me the same license code so it must be universal. As Avi suggested to me, they could be out of licenses or the limit was reached.