Hello Richard,
Since Harvest SCM is a client/server application, you will need to install both the Harvest SCM Server (broker and hservers) and the Harvest SCM Client in order to get the client applications used to access the Harvest SCM Server.
When you install the Harvest SCM Client, or Harvest SCM Client 64bit, you will get the Administrator Tool, Workbench, and the Command Line Utilities. On the installation DVD image you'll find these at \client\win32_client (32-bit) and \client\winx86_64\client (64-bit). If you're installing on the same machine as your Harvest SCM Broker you should use the version that has the same bit-level as your Harvest SCM Server software. If you're installing directly from the \client\win* folder on the DVD image, be sure to execute the "setup.exe" and not the msi file.
(If you install the Harvest SCM Workbench Only option, the SCM Workbench will be installed, but not the Administrator Tool. If you find you are in this situation, uninstall the Harvest SCM Workbench Only and install Harvest SCM Client instead.
After installation, look for the Administrator Tool and Workbench icons in the Start -> All Programs -> CA -> SCM folder on your task bar. In Windows 8 and Windows 2012, from the Start page, click the down-arrow to get to the list of all programs on the computer, then look for a section titled "CA". You'll find icons for Administrator and Workbench there.
Let me know if you need more information.