you use d2hackit and put the dupetrade file in d2hackit/plugins if the plugin folder does not exist create it and when u start d2 u just load it just like any module u load. if the file is zipped then unzippit the file in plugin folder.
(if u dont know how) u start d2 then join a game Alt+Tab out of game then go in d2hackit folder and load the exe file (don't know the name now
)
then when in game write ".load dupetrade" if the module is named that. then i guess u can use ".help" there it must say how 2 use it
but be carfule it auto-acept soo don't have it loaded if u put any stuff in the trade window and he don't have any, then he accepts, then u auto-accepts by yourself and u are scammed instead