Open in Low Resolution checkbox on Retina MacBook Pro checked and disabled

It doesn't sound like the application actually supports HiDPI mode. Here's a tutorial for modifying Microsoft Word's application package so it will support HiDPI Mode: http://imgur.com/a/0P5KY. Perhaps it would work for this application as well.

Summary of the link:

• Make a backup copy of the application

• Open the application folder, then right click the app and choose "Show Package Contents"

• Edit Contents/info.plist

• Toward the bottom of the file, just before </dict>, add the following lines:

  <key>NSHighResolutionCapable</key>
  <string>True</string>
  

• Move the app package out of the applications folder. Then move it back in.

• The application may now allow a hacked, possibly glitchy retina mode.