Unable to install with admin
The file might not be marked executable. Try this:


Open Terminal.app
Enter: "chmod u+x " (without the quotes but with the space) but don't press enter yet


3.Drop the "Install_MySQL_5.6.25.command" file on the Terminal.app window. 
The full path to "Install_MySQL_5.6.25.command" should appear.


Press enter


The file is now marked as executable and you should be able to run it.