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One of the most persistent rumors in the tech world is the "last compatible version" workaround. In the past, if you tried to download an app that required a newer OS, the App Store would occasionally offer to let you download the last version that was compatible with your current OS.

Note: This method only works if you have previously downloaded Facebook using your Apple ID in the past. If you have a brand-new Apple ID, you can log into a newer iPhone or iPad first, download Facebook there to add it to your purchase history, and then return to your old device. Method 2: Sideloading via Sideloadly or AltStore

Even after successfully installing the Facebook IPA, you must manage expectations regarding functionality.

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This is the most dangerous step. IPA archives on the internet are famous for containing malware, adware, or spyware.

Once the app appears on your iOS home screen, it will not open immediately. You must trust your own developer certificate:

If the App Store method fails, you will need to manually install the Facebook IPA file using a computer.

Open Sideloadly. It should automatically detect your iPhone or iPad.

You need to find a .ipa file that supports iOS 9. A common choice is Facebook v80-v100.

To download and install the Facebook IPA for iOS 9.3.5, you will need to use a computer and a few tools. Here’s a step-by-step guide: