Everything you need should be in here
http://www.project1999.org/forums/showthread.php?t=2651
If your trying to install the uichangesv2.zip files they go into sony/everquest/uifiles/default
If you want to use the velious UI then you need to do the above then go to the uifiles folder and make a called velious and extract veliousuiv3.zip into that folder.
eqchangesv4.zip just gets extracted straight into sony/everquest
I don't know why you would need to use the velious UI to get them working.
Edit: If your still having problems look at
http://www.project1999.org/forums/sh...ad.php?t=29437 and see if that helps any.