title: Download install and relaunch updates for your Mac/Cocoa app
body: <p>I was wondering if anybody has any suggestions for how to install and relaunch your updated app when you download it from Internet!  </p>
  
  <p>There are tons of apps that get their new versions and install and relaunch themselves but I don't know anyway but to use a second updater app to do this.  </p>
  
  <p>Any suggestions?<br>
  Cocoa or version specific or appstore specific suggestions welcome, too!  </p>
  
  <p>Basically there are 3 steps:<br>
  1- detect and download the update (easy enough)<br>
  2- replace the older app from <code>/Applications</code> with the new one<br>
  3- launch the new app   </p>