Is there any way to reinstall the plug in Norton Identity protection on chrome - AGAIN

This often happens when there is a Chrome update.  Now  Version 25.0.1364.152 m.  Norton 360 Premier version: 6.4.1.14.

 

Tried the previous solution which worked in the past.  Failed.  I get this message:

 

The 'manifest version' key must be set to 2 (without quotes).  It will not reinstall!!!!!!

 

Ughhhhhhh!  HELP!!!!