Lay Theme Forum

Hi! I bought Laytheme with three licenses and just used one so far for julgordon.de. that worked well. now i would like to use laytheme a second time for another domain.
its for alexander-proepster.com.
browser:firefox
i cannot install it because when i enter the license key it says "ivalid key".
do i need another key? how can i get it?
thank you!