Latest V1.2

install
kpackagetool5 -t Plasma/Applet --install zerotier.plasmoid
remove
kpackagetool5 -t Plasma/Applet --remove zerotier.plasmoid

Latest V1.1

if plasmoid package does nothing please use this command

install
kpackagetool5 -t Plasma/Applet --install zerotier.plasmoid    
remove
kpackagetool5 -t Plasma/Applet --remove zerotier.plasmoid    

latest

latest v1.0

if plasmoid package does nothing please use this command

install
kpackagetool5 -t Plasma/Applet --install zerotier.plasmoid    
remove
kpackagetool5 -t Plasma/Applet --remove zerotier.plasmoid