In regards to not receiving downloads upon purchasing, we believe the error to be with guest purchasing.  I've gone through the process and seen both a download link and received an email, but the email was received to my account email rather than my paypal email. For the moment, we've turned off guest checkout.  If we determine this to be the cause we will leave it off. If not, I'll have to find the issue the hard way.  Sweat, shame, and virgin sacrifices.