upgrade sapgui 6.20 -> 6.20 without interaction user

Hi !!!

We need to upgrade of sapgui version of 6.20 to 6.40. almost 1000 pc ( distribute in different places in the country ) , we don´t have a software distribution solution, we want to upgrade without user interaction, is it possible ? or maybe we need to upgrade one by one ?

The operating system is windows XP in the PC's.

Thanks a lot !!