my hosting provider has tested the .zip file and he says that:
¨I tried to install the theme file in a test WordPress installation and check that the same error is reproduced.
This error is due to the fact that the file is not a theme installation file as such and the error it shows is a generic error. You will see that if you upload any other zip file that is not a theme it will give you the same error.¨ …… The package could not be decompressed. The theme does not have the style.css stylesheet.
To solve this problem I’ve read your support documentation and I have successfully downloaded the plugins, then I have entered my license code but I can not customize the GP theme either … this is a hell!!!. please help 😉