Just install the Titanium client in a different directory and leave it be. Problem solved. This sounds like a remedy for someone who would have access to the Titanium client files and not the actual retail distribution. In other words, this is for installing the client in an unsupported (read: illegal) fashion.
Your friend may have bought Everquest and has a valid license for that distribution, but this in no way entitles one to another distribution.
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