Shows an overview of your recent post revisions on your administration dashboard.
Download RecentRevisions from http://wordpress.org/extend/plugins/recent-revisions/
No need to unzip just leave it as it is. Then from your WordPress administration page, click on Plugins -> Add New -> Upload -> Browse…
When you have found the file click OK and then Install Now.
From the Plugins Page “Activate Now”
Then select Dashboard and ensure your RecentRevisions are visible by selecting “Recent Revisions” under Screen Options (top right corner)