Downloading the correct software

I've just accessed https://fileconnect.symantec.com/ to get the latest Endpoint Protection software. I have a stupid question.

Do I need Symantec_Endpoint_Protection_12.1.3_SEPM_EN.exe (1,309.9 MB) if I have downloaded the following two?
Symantec_Endpoint_Protection_12.1.3_Part1_Installation_EN.exe (1,574 MB)
Symantec_Endpoint_Protection_12.1.3_Part2_Tools_EN.exe (240.1 MB)

My current setup is Windows Server 2003 R2 32-bit with Endpoint Protection Manager + Endpoint Protection (server side) + Endpoint Protection (XP, 7). They are all version 11.0.5002. I'd like to upgrade all of them to the latest version.

Thanks.