From a developer's perspective, old versions are a security nightmare. An outdated SSL protocol on a user’s phone can be a vulnerability for the entire network. Furthermore, if the business model is subscriptions, using an old version to bypass payment is effectively stealing the service.

This is the most common method for Android users. You will download the app file (APK) from a trusted archive and install it manually.

This only works if the developer pushed a bad update very recently (within a few days).

If you previously downloaded the app at any point in the past , Apple will offer to give you the for your current iOS.

As app stores become more sophisticated and server-side checks become more aggressive, the window for using legacy software is shrinking. The future of app archiving may lie in emulation—running old operating systems on modern hardware to simulate the experience of a simpler digital era.