PBR only for 2.8 did 2.79 FIGURED IT OUT

DID the PBR material editor get disabled for 2.79 ON mine it kept coming up with some kind of message then suddely it dissabperaed today when I wnet ot use it.
THen I go to the website and it says it is for 2.80 only and what does this mean ?

Can this be possible ? Can a addon file be changed by its programmer ? If so can I block this from happening. ?

my mistake I see I accidentally updated it This PBR stuff is great.
Soon I will have the time to get used to 280