I downloaded the "All in One Anniversary Edition" of the Address Library as noted in the STEP guide.
For PapyrusUtil, the guide says "Install PapyrusUtil AE - Scripting Utility Functions main file." but that's not exactly an option as written. The screengrab here is what I downloaded, but that shows an older version of SKSE, so is that the incorrect version of PapyrusUtil I'm grabbing?