MsiExec.exe /i install_flash_player_plugin.msi /q REBOOT=ReallySuppress
In reference to the above, according to Adobe the file needs to be placed in %Systemroot%\system32\macromed\flash for versions greater than 8.x.
Note that for a 64 bit server these keys are under HKCR\Wow6432Node\CLSID
It seemes that the /silent switch has been removed in the latest version of uninstall_flash_player.exe
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