I received quite a few messages today concerning this matter, this post should resolve everything.
After you purchase a script with instant download, please allow up to 1 hour before contacting support. Paypal may be undergoing maintenance, or updates. After 1 hour after purchase if you still have not received your download link please contact Cronus. Cronus manages everything to do with instant download, if you do not receive your link, he will first contact the mod creator to verify that payment was received, and that it was not in the form of an e-check. After verifying that payment was received, he will then manually create a download link for you. However, we do apologize for any inconvenience this may cause, and we wish this was something that we could prevent.
Hope this explains any questions you may have.
Have a great day,
Cyanide