Basically I require a launcher/installer/updater for a modification I am developing for a game. The launcher would ideally include a simple login, authenticating against an existing database, an installer which downloads the latest client and installs it to the game's directory, an updater which only updates files that have been modified, probably using an md5 check system and finally a launcher to launch the game's exe with the startup paramaters we want to specify (possibly in one of the downloaded files). I would like this to look simple, neat and professional. I would also like it to be optimised, written intelligently and be secure.