Ver 8 is no more supported by Shavlik.
Upgrade to 9.1 resolved the issue. (9.1 needs 64 bit OS)
That's correct. This error is coming up because version 8 no longer has datafiles/definitions available for download.
Just to add some details to this:
-You can download any of the currently supported versions of Protect at http://www.shavlik.com/downloads/protect/.
-I would also suggest reviewing the document, Preparing for Upgrade of Protect and Resolving Common Upgrade Issues.