Thanks for the replies. I was able to install the files from my Velious->LDoN CDs on my 64bit Windows. It was only the original game where the installer didn't work for me. I thought for a bit that the installer on the latter discs wouldn't run if I didn't have the original EQ installed but they worked fine.
I checked again and I didn't have Everquest.exe with my UF download from steam. After manually transferring files I thought screw it and just got the remaining ones from the patcher. Not sure why I didn't run launchpad.exe earlier.
Thanks guys.