We're really sorry, this is usually a cache issue on our server.
Mostly happen when you tried to download an item while you were not login, then you finally login to download it again.
This quick troubleshooting should solve the issue:
1.) Click this logout link: https://gpl-wp.com/?eqm_action=logout
2.) Recommended to clear your browser cache/history. Or if you don't want too, just open a new incognito tab (Chrome) or Private tab (Firefox)
3.) And login again from this link: https://gpl-wp.com/account-login/
If the troubleshooting steps above does not solve the issue, please let us know by opening a ticket right here.