title: Standard assets can't be found | Unity 2018.3.0f2
body: <p>I upgraded Unity version to <strong>2018.3.0f2</strong>.</p>
  
  <p>After I did it,</p>
  
  <p>I couldn't find <strong>CrossPlatformInput</strong> in <code>[Assets]tab</code> -> <code>[Import Package]</code>, </p>
  
  <p>Where is it? Was it deleted? Or had been moved to another place?</p>