how do i make a skin changer ?

[wsa30h]

i used the bf1 skin changer made by sleepkiller the side has the  same name as in ifs legion and i made sure the tga texture names matched the skin i was changing, but when i click it ingame it doesent change anything.  do i have to call it in my lua for my map ? if so what do i put in the lua ? setclassproperty is not supported i think.