Hi,
with existing activation code from windows premium security purchase I wanted to change the installed Avast_Antivirus_&_Security_6.56.1.apk on my android smartphone to premium version. But after clicking the "UPGRADE" button an error message appears that the app was not installed from google play store, so I can't obtain the next window to put in the activation code.
Is it possible to activate the app without using the google play store?
Merlin
