As the title says, I'm trying to generate a Blood Hunter, but when I get to the point of choosing it's  Otherworldly Patron, it gives me no options. Help!

You have to choose either Int or Wis from the 1st level feature before you can select an Order from the 3rd level features.

If you're referring to the Hunter's Bane, I did that.

Just to be sure, I have to ask:

• Under Hunter’s Bane you selected either “Hemocraft Modifier: Intelligence,” or “Hemocraft Modifier: Wisdom.”
• Then under Blood Hunter Order you selected either “CR • Order of the Profane Soul (Int),” or “CR • Order of the Profane Soul (Wis).”
• And you picked the same modifier for both features, either both Int, or both Wis.

Is that correct? Are you absolutely sure? Bet your house on it sure? Double triple check those please, if for no other reason than to rule them out completely.

Ah. Thank you.

I'm having the same issue with not being able to select an otherworldly patron despite having purchased several of them and downloading the books. Did I miss a step?

You don’t have to purchase anything for the Blood Hunter, that’s all free content written by Matt Mercer. Are you playing a Blood Hunter or a Warlock?