they are recommend to use trinity 2 stable but depend which char you going to bot bard, WD, good for trinity 2 atm, monk i hear someone said trinity 3 better. but for me im using trinity 2 really stable
if you want trinity 3 hope this help lol from "https://www.thebuddyforum.com/demonbuddy-forum/plugins/trinity/93720-trinity-questtools-download.html"
if you wanna use trinity 3 you should get a svn client (i.e. tortoise svn) and download / update it with it.
there should be several guides in this forum how to use it (top right -> search box) otherwise just use version 2 instead of the 3 ALPHA.
the version which is linked below is quite old and i doubt it will work with the current db (which you need since we had a patch yesterday).