Asus Plus does not recognizes Zenpad Z300C as a certified Tablet for SkyGo

I Uninstalled and re-installed Asus Plus 3 times, my Z300C is supposed to be one of the certified tablets for SkyGo but when I open Asus Plus it kindly remembers me that my device is not certified for SkyGo download.
This is really a mess.
I succeeded in installing skygo 3 months ago but now i had to update it and it was impossible to find the skygo page in Asus Plus.
Please help me.