HP LoadRunner 12.50 - Load Generator Patch 1 Silent installation Command line-in not working

Hi i have many LG server need to upgrade Patch ( LRLG_00128.exe ) 

what is the silent installation command line?? 

i tried   

.....\ LRLG_00128.exe /s 

.....\ LRLG_00128.exe /q

.....\ LRLG_00128.exe /quiet

.....\ LRLG_00128.exe /s /a /s 

and many.... 

the /? telling me to use /q.  but it is not working at all

while i try /s , it only skip untill the last confirmation part of the wizard.  

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How do i "really" perform silent installation ??