Create a file named initInExternalTerminal.bat
on cmder's root, containing the following:
@echo off
REM The following CMDER_ROOT must have the complete path to the cmder folder,
REM like "C:\Users\gabriel\Documents\Cmder"
SET CMDER_ROOT=PATH/TO/THE/CMDER/FOLDER
"%CMDER_ROOT%\vendor\init.bat"