I get the same error, and downloaded and ran EQEmuPatcher.exe which I found on a help forum thread. I ran the application and I dont get this new file it refers to "patch.exe". I put the EQEmuPatcher.exe in my EQ directory and then installed it there. And nothing. Ive tried with 2 different eq directories and now I just think I have lost my marbles.. But it is 4am. I have scanned my entire drive for this illusive patcher.exe and it is not here.. Any suggestions?
BAHAHA! Ignore my post. I am apparently tired beyond my thoughts. I neglected to plug in the appropriate directory, not once, but twice! Hoorah. I got the patcher.exe now

Sorry to waste the space!