To open a file with Stuffit Expander, first double-click the Stuffit Expander icon. Choose the Expand command from the File menu; then select the file that you downloaded. Click the Expand button. A dialog box will appear as the file is expanded into the same folder as the original encoded file (or onto the Macintosh desktop, if you didn't alter the default setting).
Then find the folder you put the extracted pieces into. Double-click the Netscape Installer icon. Click Continue at the product name. The next screen is the license agreement, which you should read carefully before continuing. Click Agree if you agree to the terms of the license. Following the license agreement, you will see a screen with up-to-date information about the product, including links to release notes and other useful hints. Click Print to print a copy of the notes. Click OK to continue with the installation. You will be taken to the installation screen.