If the official method fails, you can manually sideload an IPA file. Only download from reputable archives to avoid malware.
: A pop-up will ask: "Do you want to download the last compatible version?" Tap Download . Where to Find Messenger IPA Files messenger old version ipa
: Open the App Store on your old device. Tap your Profile Icon (top right) and go to Purchased . If the official method fails, you can manually