Just tried to install this on vB 2.2.8 per the directions, with no luck. I uploaded all of the files, then opened the install_vbstats.php file in my browser. The initial page opened up fine, but when I clicked on NEW INSTALLATION nothing happened. I was taken to the page that was supposed to be Step 3, but it was blank.
This didn't seem to harm anything because the forum is still up and running, but with no vbstats.

If I missed an explanation, I apologize... I made it to page 30 of this thread and could read no more.