I have just installed as well and have the above problem also, a blank box displaying ” admin-post.php”. Testing inside Sandbox mode or live.
Would like to get this working so I can by the advanced version and/or make a donation.
One more thing I have api credentials inserted from personal verified Paypal account, do I need to upgrade to a Business account to have digital downloads working!!!!!!!!!!!!!
The enable Paypal for digital goods button in your setup instructions returns a page not found error.
Thanks for your time in this plugin.