You can get the Simple Machines Forum software from here: http://www.simplemachines.org/
XdN Classic Theme for SMF 1.0 (tested in 1.0.1)
Version 1.0e (Jan 26th, 2005)
smf_theme_xdn_classic_1.0e.zip (123 KB)
Show Only Authenticated Users Modification Package for SMF 1.0 (tested in 1.0.1)
This modification will only show authenticated users on your Board Index and Member List. This is so if a problem user keeps registering offensive names, they won't be shown on the forum.