Installation
Copy the "iso.lib" file to the "lib" folder in the gamemaker directory.

Uninstallation
Remove the "iso.lib" file from the "lib" folder in the gamemaker directory.

The following files should be included:
iso.lib
iso functions.gml
Help.hlp
help.cnt
Example.gmd
hit ball example.gmd
Readme.txt

For everything else read the included "Help.HLP" file.