OSX has an ".iso" file reader built into its operating system natively. It's called "DiskImageMounter" and it is the default program for opening ".iso" files.
- First navigate to the folder that has the ".iso" file you would like to mount.
- Next, right (secondary) mouse click on the file and select "Open With --> DiskImageMounter"
- Next, you should now see the software installation package mounted on your desktop. Simply double click on the install file, and proceed following the necessary installation prompts.