For the deployment of Adobe Flash Player 12, one needs to apply for a distribution license (link here). Afterwards, you’ll receive a link where you can download the two MSIs:
Install them silently, using the following command lines:
msiexec /i “sourceFolder\install_flash_player_12_active_x.msi” REBOOT=ReallySuppress ALLUSERS=1 /qn /L*v C:\WINDOWS\Temp\flash_player_12_active_x.log
msiexec /i “sourceFolder\install_flash_player_12_plugin.msi” ” REBOOT=ReallySuppress ALLUSERS=1 /qn /L*v C:\WINDOWS\Temp\flash_player_12_plugin.log
Most probably, you`ll also want to disable the Auto Update feature. You can do that by creating/copying a file called mms.cfg in Windows\System32\macromed\flash\ (Or Windows\syswow64\macromed\flash for 64bit installations). The file must contain the following 3 lines:
To do a silent uninstall, run msiexec /x productCodeHere /qn /l*v logFileName for each msi, using its product code.