If the file you downloaded is under 1 GB or is an .exe or .apk file disguised as an OBB, delete it immediately.
"Download Failed Because You May Not Have Purchased This App"
Newer versions of Android restrict user access to the Android/obb and Android/data directories via default file managers.
: If you are using a newer version of the APK, it may require a different OBB (e.g., "main.11" or "main.26"). Always ensure your APK and OBB versions are compatible to avoid crashes.
A black screen usually indicates a mismatch between the APK version and the OBB version.
: If you already have the game installed, the file is located in the internal storage directory: /sdcard/Android/obb/com.rockstargames.gtasa/ : For specific projects like the PS Vita port