What is %SMS_ADMIN_UI_PATH%

%SMS_ADMIN_UI_PATH% is an environment variable on a machine where SCCM Admin console is installed.

Typically if we run %SMS_ADMIN_UI_PATH% using RUN box or Search box, we will get the SCCM console installation path as below;

C:\Program Files (x86)\Microsoft Configuration Manager\AdminConsole\bin\i386 or the drive where SCCM console has been installed.