Go to Settings > Security (or Applications) and check the box that says "Unknown Sources" to allow installation from sources other than the Play Store.
While version 412.0.0.0.5 of Facebook for Android is an older alpha build originally released in early 2023, it remains a notable point in the app's version history for users tracking performance on legacy devices. Most users in 2026 should instead use the Official Facebook Google Play Store to download the current stable version (v556+). Google Play Overview of Version 412 (Alpha) facebook for android 412 free download exclusive
Why would someone want a version of Facebook that is nearly five years old? The modern Facebook app is notorious; it is a behemoth that tracks your location, drains battery life, and consumes gigabytes of storage. It is filled with Reels, Marketplace notifications, and "Memories" you didn't ask for. Go to Settings > Security (or Applications) and
Many modern Facebook features (like Stories or 360 photos) will not work. Google Play Overview of Version 412 (Alpha) Why
If your primary goal in searching for Facebook 412 is to save storage space and boost phone performance, there is a much safer alternative: .