For your installation of POS Anywhere this may not be a desirable option and an unknown app update may adversely affect your use of the app.  A simple solution for this is to disable Automatic Updates on your mobile device.

1.    Open up the Settings app.

2.    Tap on App and iTunes Stores.

3.    Under the section titled Automatic Downloads, you’ll see an item called Updates.

4.    Tap on the toggle switch to turn it off so that it goes from green to gray. If it’s already gray, then the setting is already changed and there’s nothing you need to do further.