[mssms] Client Upgrade

[JRIT]

Folks,

I have a SCCM 2012 R2 ISO, this is the name:

mu_system_center_2012_r2_configuration_manager_x86_and_x64_dvd_2926949

Inside this ISO (D:\SMSSETUP) I have a folder named CLIENTUPGRADE. What is
this folder?