Almost made it all the way through.
I added the include line to the alpha 5 download and got to step 2 before this error:
Warning: cannot yet handle MBCS in html_entity_decode()! in /home3/wifirepo/public_html/wpmatrix/forum/bb-includes/backpress/functions.core.php on line 389
This is the same warning I get when trying to install 0.9.04.