Check your junk mail folder. Seriously. Check it again. It's probably there.
Wait a couple of hours. Sometimes their servers are bogged down.
If you still haven't received it, you can get it sent to you again by using the form on the 2dboy site.
If you paid by PayPal eCheck, be aware that it will take a few days to clear.
Failing that, contact 2dboy for assistance. Give them all the information including your paypal e-mail address.