http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player.exe. i need to use the link on a batch file and it always need to get a latest version

I am looking for a link to the latest version of firefox. that link must not chnage. so when there is a new version of firefox the link will still work. adobe flash has one. here is thier example firefox latest version link http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player.exe. i need to use the link on a batch file and it always need to get a latest version