■ method A

navigate to Ae menu:

Ae - File - Scripts - Install Scripts File… (recommend) or Ae - File - Scripts - Install ScriptUI Panel… (dock-able)

then select KBartender2.jsxbin

■ method B

copy KBartender2.jsxbin to

• Windows: <Ae root path>\\Support Files\\Scripts (recommend) or <Ae root path>\\Support Files\\Scripts\\ScriptUI Panels (dock-able)
• macOS: /Applications/<Ae root path>/Scripts (recommend) or /Applications/<Ae root path>/Scripts/ScriptUI Panels (dock-able)

launch