Alright Gwill (or anyone else who could help), I enabled debugging mode, spawned the tree, selected adult age, male gender, and tried all 4 skintones at different times, but every time I try to spawn a vampire I get an error message referring to the sim living on the lot, saying something along the lines of "Object referred to must be a person." What's that all about? I can reproduce to get the exact error # if it's needed.
You forgot to select "Switch to making Downtownies."