title: RailsInstaller: Can I maintain the gem fold when re-installing a new version?
body: <p>This is on Windows. </p>
  
  <p>I just upgrade from <code>Ruby 1.9.3</code> to <code>Ruby 2.1.0</code> using RailsInstaller( and with other component like git, devkit, etc..). I doing this by uninstall the previous version, and then install a newer one.</p>
  
  <p>The problem is that after uninstall , there is a <code>Ruby1.9.3</code> left, with gem previouslly installed.</p>
  
  <p>Now, since I upgrade to <code>Ruby2.1.0</code>, can I re-use this fold's gems? If so, How?
  Or I just delete that folder and re-install every gem again? </p>