Limited disc space after upgrade

After upgrading to Release 8 I have less disc space. It is like the content doubled in size.

File NavigatorContentCleaner.exe58.5 KB
Frequently Asked Questions: 

The upgrade to Release 8 included migrating your existing content to new folders. The upgrade was designed to move the content requiring no additional space. Some users have reported a problem and that they re-installed their content. This may leave the old content in the old directory structure. If your content is completely installed and working fine you can run the attached program to look for content in the old unused folders and remove this content.