navigate to Ae menu:
Ae - File - Scripts - Install Scripts File…
(recommend)
or
Ae - File - Scripts - Install ScriptUI Panel…
(dock-able)
then select KBartender2.jsxbin
copy KBartender2.jsxbin to
<Ae root path>\\Support Files\\Scripts
(recommend)
or
<Ae root path>\\Support Files\\Scripts\\ScriptUI Panels
(dock-able)/Applications/<Ae root path>/Scripts
(recommend)
or
/Applications/<Ae root path>/Scripts/ScriptUI Panels
(dock-able)