So in Warcraft 3 Frozen Throne there is a Custom Campaign option and it already includes one called the Exodus of the Horde. Its essentially the missing missions of the Prologue Campaign from Reign of Chaos. Its also showcases and explains how and why Thrall has DarkSpear Trolls in his Horde.
But playing it, there is no voice acting in the Custom Campaign. But I have seen a video on youtube where it does:
So then I searched and found this in mods:
~https://www.hiveworkshop.com/threads/exodus-of-the-horde-original-voice-over.264147/
But I don’t know how to install it because when I open it it takes me to the World Editor.