No, Sep 11 not supported Window8. Window8 officially supported by 12.1 RU2

About Windows 8 and Symantec Endpoint Protection 12.1

http://www.symantec.com/docs/TECH174348

Product Highlights:

1) Extended Platform support

• Mac OS X Mountain Lion (10.8)
• Windows 8
• Windows Server 2012

2) Virtualization – Shared Insight Cache for VMware vShield

3) Improved Protection

• Improved STAR protection technologies
• Windows 8 ELAM support
• Windows 8 App remediation

4) Extended Management

• Web Services for 3rd party integration (i.e. RMM)
• SEP Management Plugin for Kaseya 2.0
• GUP roaming support for multiple subnets
• Remote Sylink drop support from the SEP Manager
• Expanded 3rd party security software removal – 130 products from 30 vendors

Reference:

https://www-secure.symantec.com/connect/forums/latest-symantec-endpoint-protection-released-sep-121-ru2-and-sep-110-ru7-mp3

Article on this Latest Release of Symantec Endpoint Protection 12.1.RU2 are available, check these -

Knowledgebase Articles for Symantec Endpoint Protection 12.1. RU2

Knowledgebase Articles for Symantec Endpoint Protection SBE 12.1. RU2

Hi,

Both of version are not supported windows 8

SEP 12.1.2 are supported windows 8

SEP 12.1 RU2 is the earliest supported build which is compatable with Windows 8 and Server 2012.

Symantec Endpoint Protection 12.1 RU2 (SEP 12.1.2015) now supports additional new platforms and configurations.

You can now install Symantec Endpoint Protection Manager on the following operating systems:

Check these Articles:

What's new in Symantec Endpoint Protection 12.1.2

http://www.symantec.com/docs/HOWTO81091

About Windows 8 and Symantec Endpoint Protection 12.1

http://www.symantec.com/docs/TECH174348

Latest Symantec Endpoint Protection Releases - SEP 12.1 RU2 and SEP 11.0 RU7 MP3

www-secure.symantec.com/connect/articles/latest-symantec-endpoint-protection-releases-sep-121-ru2-and-sep-110-ru7-mp3

Best practices for upgrading to Symantec Endpoint Protection 12.1.2

http://www.symantec.com/docs/TECH163700

Downloadable Guides in reference to the Symantec Endpoint Protection 12.1 RU2

https://www-secure.symantec.com/connect/downloads/downloadable-guides-reference-symantec-endpoint-protection-121-ru2

Symantec Endpoint Encryption System requirement

http://www.symantec.com/endpoint-encryption/system-requirements

Hello,

No, You can't install on windows 8 platform.

Agreed with above comments,

You are require to upgrade the version in 12.1 ru2 for the Window8

About Windows 8 and Symantec Endpoint Protection 12.1

http://www.symantec.com/docs/TECH174348

Article

https://www-secure.symantec.com/connect/articles/l...

Article

https://www-secure.symantec.com/connect/forums/win...

Thx all :)

How about SEE?  I find that the product page (http://www.symantec.com/endpoint-encryption/system-requirements) does not mention the latest version 8.2 supporting Windows 8 or not.

Yes Till now no Support

I have already provide System Requirement check my comments

More info here:

https://www.symantec.com/endpoint-encryption/syste...

Thx all :)