"IP Scanner Licensing Error - A license was found but it does not appear to be for this computer (00:0A:00:A2:69:DA)"
This is related to an Apple-wide problem with their AppStore certificates. Here’s some more info:
http://www.imore.com/heres-wha.....maged-apps
and here:
http://www.macrumors.com/2015/.....rtificate/
About the only thing that seems to currently work is to delete the app and re-download it from the App Store.
For what it is worth, Apple has written us (and other developers) a personal letter apologizing for the problem. You can read the contents of this letter in the second link posted above from the MacRumors site.