As of March 2019 Zedge on Google Play requires Android OS version 5.x (Lollipop) or later.
The Zedge Wallpapers for iOS requires iOS version 9.2 or later.
If you do not have a device capable of supporting the minimum OS version, you will not be able to continue to use the Zedge app.
You can find which version of operating system you're running in your device settings.
Most of the time, you can choose to allow your apps -- including Zedge -- to automatically update when a newer version is released and most of the time this happens in the background without you even noticing. You'll just see something new.
Sometimes, major changes in our app architecture requires that we stop allowing certain older versions of the app to connect to our services.
In some cases, this may even result in your device -- if it is too old or doesn't have the latest version of the operating system or components on it -- to continue to run a minimum version of Zedge at all.
We work hard to make sure the Zedge app works on the most version of phones possible, but like most apps -- at some point-- continuing support for devices past a certain age becomes impossible.
If you run into a situation where you can no longer update or run Zedge on your device, we apologize and hope that if/when you decide to upgrade to a newer device, you'll choose to install Zedge again. In the meantime you can interact with some of the content on the web at zedge.net