Disclaimer: This paper is for informational purposes only. Downloading applications from third-party sources poses significant security risks.
Go to Settings > Security and allow "Install from Unknown Sources." facebook download old version
Instead of hunting for old software, install the official Facebook Lite app. It mimics the speed and simplicity of the 2016 design but receives modern security updates. You get the battery life you want without turning your phone into a security risk. Disclaimer: This paper is for informational purposes only