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Following on from my blog on patching the Forefront client here...
http://www.itgeek.co.nz/post/Patch-or-slipstream-Microsoft-Forefront-Client-Security.aspx
You can apply this process to update Forefront Client Security to 1.5.1972.0 (dated 03-Jun-09).
Download the update from the following location
http://catalog.update.microsoft.com/v7/site/ScopedViewInline.aspx?updateid=506bb1e4-a125-4788-9f78-5151c558d32d
Once downloaded you will have a directory containing the following archives.

To extract type the file name with the /extract parameter.
For example c:\<path>\all-fcsam-kb971026-x64-enu_1fff376d2e6d7021f316cc48be9cbe993cb06f1a.exe /extract for x64
or c:\<path>\all-fcsam-kb971026-x86-enu_a25e95520a2a0cad890e9b644a9d1c63757ccd7d.exe /extract for x86
Just select the language and processor architecture you require.
To see the rest of the update process take a peek at the previous blog here…
http://www.itgeek.co.nz/post/Patch-or-slipstream-Microsoft-Forefront-Client-Security.aspx
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