I re-documented the instructions to reduce the confusion. Sent DB a copy a while back but I think he must have been too busy to put it in the Database.
A lot easier to install

Tested on 5.47e and worked great.
*this makes it easy to use SSI on any of your threads without changing your .htaccess to parse all .html files which will slow a busy board down. My reason for using this was to include the Who's online feature that will allow drilling down to the thread people are viewing.
<-- Get it here --> Props go to DB + Montego for this as I just 'fixed' the instructions.