What I did to get all mercenary/colonist models was in the SC2 Editor, go to File -> Open. Log in and then change source to Blizzard. Search "Left" and then load the "Left 2 Die (Mod)" version 1.0. After it loads, go to the previewer, Units -> Terran -> Colonist male/female should now all appear correctly.
What I did to get all mercenary/colonist models was in the SC2 Editor, go to File -> Open. Log in and then change source to Blizzard. Search "Left" and then load the "Left 2 Die (Mod)" version 1.0. After it loads, go to the previewer, Units -> Terran -> Colonist male/female should now all appear correctly.