Hi Randy,
Sorry to have kept you waiting.
At present, you can find a link to download the Asset Discovery Tool on the homepage of our
support portal.
This is where it points you to:
https://extremeportal.force.com/ExtrDownloadDetail?id=a41340000005Rmw (Login required)
-Drew
Edit (1/23/17): Updated download link
Edit (1/29/18): Updated download link and location information