This was pre patch this patch tuesday, where there was need for a category for beta and live versions.
The one you went too was from this first category and wouldn't have worked last week.
As for the description, as it wasn't the main page, the author didn't take the time to treat it as it was (since it will be merged/deleted soon anyway)
The actual page for it is at
http://www.wowinterface.com/download...nitFrames.html
As for the technical issue, sorry I don't know about that, I don't use X-Perl