im not sure if this is the right forum, but...

i have version 4.10.9 pro (i think) and it says i can update to version 4.12. i follow all the links and everything, then click the 'already bought PRO' link and it says to enter my email address i bought PRO with. but my problem is A) im not sure what email address i used and B) i think it may be an email address i no longer have any access to. (and entering this email address will enable me to upgrade without paying again right?)
so is there anyway i can change my registered email address so i can download the newer version without paying again?

i dont know if im actually making sense here, but any help is appreciated.