Oompa

Would appreciate some input as I can follow directions fairly well but am not computer savy. Been a few years since I played BG1 so I bought the boxed set and am trying a mega-install following the FAQ/walkthrough by Dan Simpson dated 27 Feb 2010 v3.4. I got as far as installing Turnabout and went to install BGT in my game directory - however I am getting the error "Unable to find DIALOG.TLK in: dialog.tlk". I have BGT WeiDU version 1.10 dated 28 August, have it installed in my game directory (D drive), and can see the dialog.tlk file in that same location. The original file after the BG1 and TotSC install had 3.2 MB and now has 8.3 MB so I assume that these mods (patch for TotSC & ToB, oversight mod, BG2 fixpack, and Ascension) have changed the file, but don't know if that is part of the problem. What am I doing wrong? Thanks for any ideas/help!