I am also unable to install the prerequisites on 5.4.0. I would guess that the only tests of Kual on the PW2 were on the few units that were JB via the serial port so it's possible that something works diferently with the end-user JB. I'm sure Twobob & the team will look into it when they can
JB was successful on my device and I am running Niluje's standalone screensaver hack
from this thread without problems (just with custom images, I don't use the "cover" function so didn't install the python .bin)