DQ Patcher

  DQ Patcher is a hash-block map patching tool aimed at making the patching process as simple as possible.
  It allows you (and your testers/clients) to use less traffic by skipping the download of unnecessary blocks of data.
This is excellent tool for organizing multiple alpha/beta tests of your game - it will allow you and your testers to conserve bandwidth.
  Despite of other tools, no matter what build version has client - DQ Patcher will update it to the latest one.
  Moreover, it can patch itself and Unity`s dll files, i.e all files in the game directory.

  This version works on Windows, MacOS X and Linux platforms.