Same problem!
UPDATE: Sorted now, thanks.
I am getting the same issue:
{“error”:”Download link sent to your email!”,”downloadurl”:””}
Running Version 4.0.5 on 3.8.1
I also have the issue where when clicking on Jetpack—->Site Stats the page displays Download Statistics, it’s as if both use /wp-admin/admin.php?page=stats
Same here: Order ID# 51d28860cfc50