When you search for "Messenger IPA iOS 9.3.5 full," you are likely looking for one of two things:
Target Keyword Density: 4 occurrences of "messenger ipa ios 935 full" (natural placement).
But what exactly are you downloading when you hunt for these legacy IPAs? Is it safe? And why has Facebook made it so hard to keep these older devices connected?
The simplest way to get a compatible version is through your App Store history.
: If you have never downloaded Messenger on your account, you must first "purchase" (download) it on a newer device running a current version of iOS using the same Apple ID.