
only two options ,,if bought by the web shop annd you still have the activation e mail ,,
or you still have the software loaded on a computer and in the help section there is a about tab ,,on later versions the key was stored in that tab ,,
mixvibes cant keep track of who buys software untill it regerstered in the fourm ,,in the latter versions is was added to that tab ,,other than thoese two options ,,you can contack the indiviual in the link