Hi,
Sorry for the issues you are having.
I can try to help out here.
I looked up the orders and only seeing this message:
Order cancelled by customer. Order status changed from Pending payment to Cancelled.
There has been other successful PayPal orders since you tried to make yours.
I found a couple mentions of this from searching on other sites, but no one had presented a solution and it looks to be rare.
One person said it was an issue with not sending the Shipping Information, but as it is a downloadable product that is typically not needed.
I changed a setting that might help.
Please try again.
I also, extended your license a week so we have some time to figure this out.
Thanks