Disable automatic updates globally: Settings > App Store > Automatic Downloads > App Updates = OFF . Additionally, disable Wi-Fi-assisted updates.
The standalone Messenger app works independently. Version 1257 of Facebook will still link to the most recent Messenger version. download facebook ios 1257 updated
Some third-party tools (e.g., , AltStore , iOSGods ) claim to let you install old .ipa files. Risks include: Disable automatic updates globally: Settings > App Store