I have the above problem.
Upon reading the walkthrough I came upon this written below.
"There have been major problems with getting Trollslayer to join your party, so if he doesn't respond to you, you need to download the Trollslayer fix file from the Dark Side home page and unzip it in your override file (I think that's where it goes, just follow the instructions). Resume playing from the game that you strategically saved just before the battle."
Has a fix been written for EE?