While installing APKs from outside the Play Store is not illegal, it can void warranties or violate the Terms of Service for certain apps.
If you have a legitimate reason to install an APK file from an outside source, follow these standard steps: Go to Settings > Apps > Special App Access . Download basemo3ad apk
Review the permissions requested by the app before clicking Install . Critical Safety Warning While installing APKs from outside the Play Store
Could you clarify if is related to a specific game mod or a developer you are trying to find? Build your app for release to users | Android Studio Download basemo3ad apk