You can legally download older versions of IMO from reputable, archive-focused sources like APKMirror (which verifies signatures). However, you will still face security risks from unpatched vulnerabilities. Also, older versions often stop working when IMO updates its server API. You will receive an “update required” error.
: Users often feel newer versions are cluttered with "annoying" pop-ups, vibrations, or persistent home screen redirections. Key Features of imo (Standard vs. "Premium") imo old version premium apk
You cannot truly unlock server-side premium features with a client-side mod. IMO’s servers verify your payment status. An old APK cannot fake that verification on the modern IMO backend. You can legally download older versions of IMO