This applies to version 11. I am running version 12. If it didn't support 64-bit, I'm sure there wouldn't be a SEPx64 install folder and the readme would not say the following if it didn't support server operating systems.
New operating system support for the client
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-- Microsoft Windows 7 (All versions)
-- Microsoft Windows 2008 R2
-- Microsoft Windows 2008 SP2
-- Microsoft Windows Vista SP2
(is no one running 12?)