Look behind your spam filter. Very likely the email with the download link ended up there. The email with the download link is automatically send to you within just a couple of minutes, but in the worst case it might take up to 30 minutes before it arrives in your inbox.
Otherwise, check on PayPal if your payment came through completely. Maybe your payment is still pending. In that case: finish the payment, and you'll receive your download link automatically.
If none of these is the case for you, just contact us and we'll figure it out together.