Launch the SaveAsPDF.exe file and click Run when the security warning appears.
Accept the license and terms and click Continue.
The application installs …
Installation complete … click OK.
Now when you open say Word 2007 you will notice the ability to use the new feature.
According to the Microsoft site this Add-In can be used in 8 of the Office applications. So far I have successfully tested it in Word, Excel, and PowerPoint.