Hello,
There is no specific document on the prerequirements for windows 8 OS to install symantec endpoint client. It is important for you to know that Windows 8 is supported from Symantec Endpoint Protection 12.1.RU2 onwards. Currently the latest version is Symantec Endpoint Protection 12.1.RU4.
However, there are few documents which you be helpful to you -
About Windows 8 and Symantec Endpoint Protection 12.1
http://www.symantec.com/docs/TECH174348
Preparing Windows operating systems for remote deployment
http://www.symantec.com/docs/HOWTO80805
It states - Prepare Windows 8 or Windows Server 2012 computers
Before you deploy, perform the following tasks:
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Disable the Windows Firewall.
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Create the registry key LocalAccountTokenFilterPolicy. For more information, visit the following URL:
http://support.microsoft.com/kb/942817
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Enable and start the Remote Registry service.
Hope that helps!!