You have 3 unlock keys when you buy LFS. Once you use them all you will recive one key every 1st of the month, and it can get up to 2 keys max.
So, I'm sorry but you need to wait for the 1st of the next month so you can unlock it again.
Maybe you can contact devs for a key but I think you need a good damn reason for that, so I wouldn't get my hopes high.
Be carefull in the future
Best regards,
BlackEye
Edit: damn you Tweak
lol...
Btw, is RSC down or something?