You don’t need to do anything. The Play Store automatically serves the correct APK variant based on your device’s primary ABI. To check if you are running 64-bit Facebook:

Last updated: 2026 — The 64-bit transition is now complete for Facebook on Android, with legacy 32-bit support maintained only for Android 8 and older devices.

This means the download was corrupted. Delete the file and try again. The Bottom Line