You can check the current version of your app by going into Settings within the app, near the bottom the version is displayed.
On each of your devices, please go to the App Store, click "Updates" and update Invoice Simple to the latest version.
If you're having trouble, here are some detailed steps: http://www.tech-recipes.com/rx/58824/update-ios-apps-iphone-ipad-ipod-touch/
Updating Invoice Simple for iOS
Its important to keep your app updated to the latest version
Written by Raphael Barbosa
Updated over a week ago
Updated over a week ago