I'm still quite new to the z-wave stuff and can unfortunately due to my job only work on it in my limited spare time (but then I use all time I have

My question is, how these updates are applied, where the firmware files can actually be acquired and whether this can be done through Domoticz, or whether I have to buy the control system from each vendor (which I obviously wouldn't want).
I'd be happy if somebody could bring a bit more clarity in this whole Z-Wave firmware jungle to me. Thanks a lot in advance!