When I tried to submit using manual payment, the email I received from the Pro Sites have no activation key nor the activation link. Here is the email I received when someone upgrade to Pro Status using manual payment submission.
The user "site1" has submitted a manual payment request via the Pro Sites checkout form.
Level: 1 - Basic
Period: Every 12 Months
User Email: email@example.com
Activation Link: http://wp-activate.php?key=
Site Address: http://balidirectoryportal.com
Manage Site: http://gslide.balidirectoryportal.com/wp-admin/
Payment Amount: 50