If you are getting this notice from an application called "Bokeh", upgrade manually to Blitz at blitzapp.com.
Don't worry, your license information will transfer over.
Blitz (com.elgebar.blitz) is a Mac software application that has been discovered and submitted by users of Software.com. The latest version that our users have reported running on their systems is Blitz 1.1.1. The most popular version of this application used by our users is Blitz 1.0.2.
Operating System: Mac
Default Install Path: /Applications/Installierte Programme/System/Blitz.app