Level 9 for Mac - Source code

The accompanying file "Level9-Source.iso" is a disk image which contains the Level 9 source code and supporting documents &c. To get access to the source do as follows:

Mac OS X: 
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Double-click the disk image and it will mount on your desktop as a removable disk. A window will open and you simply drag the contents to wherever you would like to store them on your hard drive.

Linux/Unix/Windows
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If for some reason you want to get at the Mac source code then you can do it as follows:

Linux/Unix: Again, double-click the ISO disk image and (in the vast majority of modern distros) you will be at least asked if you want to open the file for editing/burning or mount it as a disk.

Windows (2000, XP, Vista, 7): does not suport mounting of disk images of any form natively but there are any number of free, shareware and commercial utilities to do it. One example is:

Virtual CloneDrive <http://www.slysoft.com/en/download.html>

Alternatively, you can burn the image to a CD/DVD and mount that normally.