The install fails on my up to date MacBook, AVG gives me 4 warnings about threats due to Dauntingly, then the install tell me this software cannot be installed on this type of Mac.
Does Fritzing install naughty stuff? And why doesn't like my mac?
I have it installed on a Macbook Pro OSX Sierra and it install without any problems. I do not have AVG or any other Anti-virus program installed on it at the moment.
Try disabling the AVG for the installation. Maybe that will help install the program.