Hello,
For Downloading the French version "Symantec Endpoint Protection 12.1 RU2 MP1 Client-only patch", you can go to https://fileconnect.symantec.com/
1) Select English as Language
2) Login with your Serial Number
3) Accept the Agreement
4) Select the Product Language as "Symantec Endpoint Protection 12.1 - French"
5) And you would see the "Symantec_Endpoint_Protection_12.1.2_MP1_Win32-bit_Client_FR.exe"
and
"Symantec_Endpoint_Protection_12.1.2_MP1_Win64-bit_Client_FR.exe"
Hope that helps!!