Number 1: First, download the Robotech TC. (you can get it off the main page)

Number 2: Download Robotech TC: Atomic edition patch. (located bottom of this page).

Number 3: Install Robotech TC. Ignore all errors that might occur.

Number 4: Unzip "robtcat.zip" (Robotech TC: Atomic edition) patch in your duke directory.(this will fix all of
those error messages from the first install and add more files.) Overwrite all files.

Number 5: Start Robotech TC by launching "Rtech.bat". If you want a multiplayer game, launch robset.bat.
The Robotech TC multiplayer game in my opinion is THE best part about the TC.