: Authentic apps from the Google Play Store are signed by the original developer (Innovation Drive Studios).
: Because the signatures won't match, you cannot "update" an official version with a mod; you must uninstall the original game first, which often deletes your progress. Risks and Security Warnings Download Big Farmer Town Offline Games Mod Signed apk
: Since modders don't have the original developer's private key, they must "re-sign" the modified file with their own key. : Authentic apps from the Google Play Store