Which of these steps is not clear???

You don't have to install SH3D.

1 - Unzip the file you downloaded.
2 - Right-click the SH-script (881 bytes)
3 - Choose Properties
4 - Under Permissions check the box before Allow execution as program
5 - Under Open with verify that the program uses Oracle Java 7 Runtime
6 - If necessary, uninstall all Java versions and install Oracle Java 7.

Hans