Not installed on the server I'm remotely managing at the moment (Windows SBS 2008 R2).
I can only find links to the manual in the Support Downloads section at dell.com.
Easy points up for grabs (hopefully).
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This should do the trick. (Updated for version 7.2.0 A01 released 1/11/2013.)
If you know the filename you want to download, in your case it would be OM-SrvAdmin-Dell-Web-WIN-6.5.0-2124_A00.22.exe, then all the files are available in ftp.dell.com/sysman/
For help with the naming conventions have a look at http://ftp.dell.com/sysman/New%20file%20naming%20convention%20for%20OMSA,%20ITA,%20DRAC%20and%20BMC%20software%20releases.docx