Google Account is not usable for the modded APK's for ages sadly.
A way to handle this would be to:
* Install original game from Google Playstore
* Log in with Google Account, make sure it's the correct one.
* Also link said Choice account to a FB account (still on Original game).
Before you purchase anything, lets make sure things work as intended, so now:
* Uninstall Original game.
* Deactivate Facebook.
* Restart Phone/Pad to make sure no cache is still in the system.
* Download and install the modded APK from Gourov
* Log in with the Account Name and License (or Alt Code if the first doesn't work)
* Register/Log in to the FB Account (FB Lite will pop up).
If the correct account is now live, great!
At this point you can then re-trace the steps and uninstall the modded APK, install the original game - make the purchases you want or need (I use Monthly VIP) over Google.
Uninstall Original game, move back to install modded APK, log in - keys/VIP should be live!
Now you can re-activate FB on your Phone/Pad, and will only need to re-do the steps when a new version is updated.