do you know that?
use chrysalys and change the installer for 3.18
or for use rexxsyslib
copy muirexx in c or by easy intaller
in user starup
;BEGIN ARexx
assign >NIL: MUIRexx: c:
If Exists mossys:libs/rexxsyslib.library
rename Mossys:Libs/rexxsyslib.library Mossys:Libs/rexxsyslib.library_disabled
EndIf
;END ARexx