title: Error loading watir-webdriver
body: <p>Is there a way to install an earlier version of watir-webdriver including dependencies?</p>
  
  <p>I've been running watir-webdriver for a while now, but just ran into problems today when installing on a new Windows environment.  </p>
  
  <p>The error is on the require "watir-webdriver". The first error line indicates that ruby is unable to load ffi </p>
  
  <pre>
  C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- ffi_c (LoadError)
  </pre>
  
  <p>It looks like the problem may be with the combination of gems, so am including the versions here:</p>
  
  <pre>bigdecimal (1.2.4)
  childprocess (0.5.3)
  ffi (1.9.5 x86-mingw32)
  io-console (0.4.2)
  json (1.8.1)
  minitest (4.7.5)
  multi_json (1.10.1)
  psych (2.0.5)
  rake (10.1.0)
  rdoc (4.1.0)
  rubyzip (1.1.6)
  selenium-webdriver (2.43.0)
  test-unit (2.1.3.0)
  watir-webdriver (0.6.11, 0.6.10)
  websocket (1.2.1)
  </pre>