Are you trying to a specific version on an old device, or
file, you cannot simply drag it onto your iPhone. You need a sideloading tool: Sideloadly / AltStore:
This is the most common method for non-jailbroken devices. It involves using a desktop app to install the IPA. On your computer, you will need to install a tool like or AltStore . After connecting your iPhone, you simply drag the IPA file into the app, enter your Apple ID credentials (used for signing the app), and the tool will install it on your phone. A more modern tool, DLiPA , can perform these steps directly on your iPhone, though it may require an initial setup via a computer.
the IPA file into the app and enter your Apple ID credentials to install. 3. Jailbreak and AppStore++ (Advanced Method)
If you are using an older device, here is a guide on how to safely handle old IPA versions. 1. Official Way: "Download Last Compatible Version"
There are three primary ways to acquire and install an older version of Messenger: I am looking 4 Facebook messenger ipa for ios 12.5