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The easiest way is to go to Android Drawer and look for older apks. If you find the one you want, uninstall the updated app from your device and install the new/old version. Make sure to turn off auto-updates. If you are rooted, you can also check your backups (you do make backups….right?) for older versions of the app. It’s more of a pain than just finding an old version, but then again you can’t always find the version you want. Apps that are installed by the carrier or manufacturer, aka bloatwear, that you can’t uninstall usually has an option to uninstall updates, but that doesn’t let you choose a version beyond that.
There is also an app that I’ve heard of but never used called AppDowner. If you want to try that one, you will need to sideload it from XDA developers. Here is the AppDowner thread: http://forum.xda-developers.com/android/apps-games/root-appdowner-downgrade-apps-easy-t2828705