title: Do I need to revert to an older version of Rails just to run a single legacy app (among other problems)?
body: <p>I have an older Rails app that I need to run. But I have the latest version of Rails.</p>
  
  <p>When I try to run this older app it says:</p>
  
  <blockquote>
    <p>Missing the Rails 1.99.0 gem. Please
    <code>gem install -v=1.99.0 rails</code></p>
  </blockquote>
  
  <p>But when I run the command: <em>gem install -v=1.99.0 rails</em></p>
  
  <blockquote>
    <p>ERROR:  could not find gem rails
    locally or in a repository</p>
  </blockquote>
  
  <p>Not sure what to do next. Could someone help me understand what's happening here?</p>
  
  <p>And my second question, related to this problem is: It seems silly that I need to revert to an older version of Rails just to run this one legacy app - there must be a better way of doing this?</p>