I have a paid-for copy of graphene mobile on my main website (9 downloads still available).
I have a test-website (created with XCloner). I want to do an "update now" to v1.2.8 of graphene mobile on my test-website.
I get error message "The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature". In advice to a previous post-er you suggested using settings to update the api key. I have tried inputting the api key on the test-website but I still get above error message.