message: update pre-install script to get version number dynamically
diff: -#!/usr/bin/env bash
  +#!/bin/bash
  # Kill the existing running instance
  sudo killall Symphony
  @@ -12,7 +12,7 @@ delete_app()
  compare_versions()
  {
  # Get the installer version:
  - CURRENT_VERSION=4.4.0
  + CURRENT_VERSION=${APP_VERSION}
  # Get the currently installed version:
  INSTALLED_VERSION=$(plutil -p /Applications/Symphony.app/Contents/Info.plist | awk '/CFBundleShortVersionString/ {print substr($3, 2, length($3)-2)}')
  