How to get the old Facebook app for an iPhone 4?

I tried using installous, but it doesn't have the older app versions anymore.

GAMES AND APPS
learn how to use games and app on your smart phone,
iphone 4
1. Tap photo (top left of any page)
2. Type the name of the game or app in the search box
3. Tap the app

Note: You will need to give the app permission before you can start playing
if you haven't installed the app on your mobile phone yet, we'll send you to the apps store to get it before you start playing

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