When the download is complete, double-click to extract the file. The extraction should be done by the system.
If you have any trouble please contact Technical Support.
A new window appears on your screen. Drag the Wolfram Workbench.app icon to the location on your hard drive where you want to install it. When all files have been copied, double-click the icon on your hard drive to launch the program.
A window will appear asking you to select a workspace. Either accept the default or browse to select a different folder for your workspace, then press OK.
Wolfram Workbench will now start and you will see the main window. This completes the installation process.