1. Download the SapGui.zip file from http://cba.uah.edu/tutorials/sap/sapgui.zip.  Choose Save.
2. Right click on the file you just saved and choose "Extract All."  The default location should be fine, make sure the "show extracted files when complete" box is checked.
3. Double click the setup.bat file.
4. The SAP Front End Installer should open.  Click next, click "Select All," click next again.  The GUI should now install.  Once the install is complete, click Done.