Rekordbox Activation & Deactivation Issue

Hi There,

I've a Activation Key and I used it perfectly with my PC, But today I've backup-ed my Rekordbox database and formatted my PC..

After reinstalling the Rekordbox and trying to activate the Rekordbox i'm getting an error that this key is already been activated in another PC.. try to deactivate it on it and activate on another PC..

So I've understood that I've forgot to deactivate the Rekordbox in the previous version of my PC and so now i'm not able to use the activation key to activate the Rekordbox..

so please give me an idea to resolve this problem