When a purchase is made in the e-commerce, with a registered account, the transaction is verified in paypal and the download link is activated, the waiting time is 2 to 4 hours. The advantage is that you can access the account and download the source as many times as necessary.
When a purchase is made in the “Check out whith paypal” option, the purchase link is available immediately. The disadvantage is you will have access to the download link only once.
If you have any difficulties please contact me firstname.lastname@example.org.