I'm using 2.91 but it should work with other 2.xx series and with the new 5.x also.
Have you installed the plugin in winamp like instructed here:
http://www.skippari.net/phpBB2/viewtopic.php?t=403 ?
"You need to put the vis_lcdinfo.dll from the lcdinfo package's /extra_dlls/ directory to your winamp/plugins directory and set it as the current visualization plugin in Winamp. You might also want to check Auto execute visualization plug-in on play from Winamp's plugin settings. "
Without this you don't get any data from winamp.