You won't find these legacy versions on the official App Store. You have to look for digital archives. Websites like , IPSW.me , or specific GitHub repositories hosted by the legacy jailbreak community often host these files.

: Surprisingly well-supported, it remains one of the few messaging apps that is still usable and relatively fast on iOS 9.3.5.

When searching for IPAs, stick to reputable archives like the Internet Archive (Wayback Machine)