Here is a link to evaluation version but I'm not sure if it turns into the full version once installed.
http://www.microsoft.com/downloads/details.aspx?FamilyId=7376214F-CBA3-4E0D-81FE-AD52488BE3A3&displaylang=enAlso a quick check to see if R2 is installed is to look and see if you have a collection name "All Unkown Computers"