Hi
I’m seeing this error too.
You have version 1.2.74 installed. Update to 1.2.76. View version 1.2.76 details.
Compatibility with WordPress 4.3.1: Unknown
Updating Plugin GP Premium (1/1)
Downloading update from …
An error occurred while updating GP Premium: Download failed. Unauthorized
In the GP setting screen I have ticks on the email address and the Updates section