Some emails go to the email address you used for your purchase - especially if you used paypal, because that's the only email we have associated with your purchase. ;)
If you register to the forums with a *different* email, then that's usually why.
These forums were CLOSED to new posts on November 19th, 2012. New forums are here: http://www.studiopress.com/forums/
and you will need to SIGN UP AGAIN.
If you need assitance with setting up your theme, go to http://my.studiopress.com/
and read the SETUP links or the TUTORIALS link on the side tab.
If you need Account Assistance
, file a help desk ticket at the same location.