Unable to find addons (MQTT, Denon and others)


I installed Openhabian on my Raspi 3 and also on Mac. In both, when I go to the paper UI -> addons, I didn’t find all of those which are listed in the documentation (http://docs.openhab.org/addons/bindings.html).

Took screenshots of the 2 of the missing addons, viz. MQTT & Denon, out of which I can only attach 1 for now.

Could I be missing steps?