Hello @mike!
The libraries folder from v0.22 has moved inside the hardware folder, so when you copy this folder to the Arduino path, you are already copying the libraries needed.
This seems to be out of sync with the post, thanks for noticing it.
Did you install the Arduino SAMD Boards package?
What commit did you download?
I need more info since I haven’t seen that error before and I haven’t been able to reproduce it yet.