Wow..........
Download the files here with your SEP 12.1 Serial number.
https://fileconnect.symantec.com
Product Guides
Symantec™ Endpoint Protection and Symantec Network Access Control 12.1.2 Installation and Administration Guide
https://www.symantec.com/business/support/index?page=content&id=DOC6153
Symantec™ Endpoint Protection and Symantec Network Access Control 12.1.2 Client Guide
https://www.symantec.com/business/support/index?page=content&id=DOC3719
About Symantec Endpoint Protection 12.1.2 product guide locations
http://www.symantec.com/docs/HOWTO81153
Installation and Getting Started.
Symantec™ Endpoint Protection 12.1.2 Getting Started Guide
http://www.symantec.com/docs/DOC4322
What's new in Symantec Endpoint Protection 12.1.2
http://www.symantec.com/docs/HOWTO81091
System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.2
http://www.symantec.com/docs/TECH195325
Symantec Endpoint Protection for Macintosh Frequently Asked Questions
http://www.symantec.com/docs/TECH134203
Supported upgrade paths for Symantec Endpoint Protection Manager
http://www.symantec.com/docs/HOWTO81069
Supported upgrade paths for the Symantec Endpoint Protection client
http://www.symantec.com/docs/HOWTO81070
Upgrading or migrating to Symantec Endpoint Protection 12.1.2011 (RU2)
http://www.symantec.com/docs/TECH197426
Migrating from Symantec AntiVirus or Symantec Client Security to Symantec Endpoint Protection 12.1 or later
http://www.symantec.com/docs/HOWTO80791
Upgrading to a new release of Symantec Endpoint Protection
http://www.symantec.com/docs/HOWTO80759
Best practices for virtualization with Symantec Endpoint Protection 12.1.2
http://www.symantec.com/docs/TECH197344
Symantec Endpoint Protection Manager 12.1.2 Database Schema
http://www.symantec.com/docs/DOC6039
About the types of Group Update Providers
http://www.symantec.com/docs/HOWTO80957
How to's
Why do I need to replace the client-server communications file on the client computer?
http://www.symantec.com/docs/HOWTO81261
Restoring client-server communications by using a client installation package
http://www.symantec.com/docs/HOWTO81455
Managing the client-server connection
http://www.symantec.com/docs/HOWTO81337
What is the processing order of an Explicit GUP list within version 12.1.2 of Symantec Endpoint Protection?
http://www.symantec.com/docs/TECH196741
Troubleshooting
Error messages appear when installing Symantec Endpoint Protection 12.1.2 on Windows 2000
http://www.symantec.com/docs/TECH196257
After upgrading to version 12.1.2 of the Symantec Endpoint Protection Manager, an error is displayed when trying to launch the SEPM's Java remote console
http://www.symantec.com/docs/TECH198977
Creating a network scan password with SHA-256 hashing after upgrading to Symantec Endpoint Protection 12.1.2
http://www.symantec.com/docs/TECH194754
The Symantec Endpoint Protection (SEP) 12.1.2 Host-Integrity Custom Requirement for Checking Symantec Antivirus-Infected is Not Backwards Compatible to Previous Versions
http://www.symantec.com/docs/TECH196253
Compatibility between Symantec Endpoint Protection/Symantec AntiVirus for Macintosh and HFS Extended, case-sensitive formatted volumes
http://www.symantec.com/docs/TECH104314
Navigation to the next page of the Audit report saved from the Symantec Endpoint Protection Manager shows the error "A Runtime Error has occured. Line:9579 Error:Object expected"
http://www.symantec.com/docs/TECH195152
Hope this helps..............................