Quite Revealing is an Adobe Acrobat plug-in. In other words, you use Quite Revealing from within Adobe Acrobat.
When you buy Quite Revealing, you're entitled to both the Macintosh version and the Windows version.
You must have installed Adobe Acrobat 7.0/8.0/9.0/10.0/11.0 Professional or 7.0 Standard. Note that Quite Revealing will not work with the free Adobe Reader software.
If you're using a Macintosh computer, you must be running Mac OS X 10.4 or above.
If you're using a Windows computer, any Windows version is okay as long as it works with your version of Adobe Acrobat and as long as your version of Adobe Acrobat is one of the versions listed above.