SEP upgrade from 12.1.6 (12.1 RU6) build 6168 to 12.1.6_MP1a

Hi,

I am using Symantec Endpoint Protection Version 12.1.6 (12.1 RU6) build 6168 with 1000 users license.....

I want to upgrade with Symantec_Endpoint_Protection_12.1.6_MP1a for the same....

What will be procedure to do this action......is there any new license purchase required or I can upgrade directly..... ???

Please give the suggestion

Susheel Kumar Jain