How to reinstall previous versions of Apps on iPhone
I have read many, many reviews on iTunes where users were complaining about losing features when they updated an app, or the new version kept crashing, or it was just a very bad update. Sadly almost all of these users are unaware that you can easily reinstall the old version. That being said, I would like to issue this warning, read the most recent reviews before updating an app you use frequently or care about.
The app update process works by downloading the new version and placing the old version into the trash. When you update from your device and sync with iTunes it will pull the new version from your devce and place it into iTunes while moving the previous one from iTunes to the trash. Now suppose that the new version has added ads or removed features, or just plain doesn’t run well on your device. You are not out of luck. Simply delete the app from your device, delete the new version from iTunes and drag the previous version back in. You can now sync it to your device again. So as long as you haven’t emptied the trash since you updated you will still have access to the old version.
I would suggest backing up all old versions just to be safe. When you update and apps are moved to the trash can, simply drag them into another folder. Create a backup folder and store it somewhere on your hard drive. Now if an update is just horrible you can leave a review and let the programmer know, but you won’t be out of luck until the mistake is fixed. By the way, this is for both windows and mac.