Critical Role: Tal'Dorei Campaign Guide?

Is there any way to get access to the campaign guide for Roll20? So far, it seems the only way to gain access to the Blood Hunter class (for players, anyway) and the Gunslinger Fighter archetype. I could be completely wrong. I am very new to Roll20. But is there a way, if not through that?

Unlike the Wildemount book, Tal'Dorei was completely a Green Ronin publication. I don't think Roll20 has any kind of publishing agreement with GR to date. If you want it, I would suggest petitioning Green Ronin, or possibly Critical Role. As an aside, nothing prevents you from entering anything you like manually. All the digital books give you is easy access within the Roll20 environment.

That's fair. But my main question is how do I make a Blood Hunter, an entire class, for it? Again, I'm completely new to this.