Hi, I see you wish to uninstall Flash Player using silent uninstallation process, and then upgrade to the Latest version of Flash Player which is 18.0.0.200, For silent uninstallation please refer the page - Silent install command line argument doesn't work | Flash Player 10.1‌, <path to uninstaller> -uninstall {flash player type(optional)} will uninstall specified Flash Player types installed on your system, remove the {flash player type(optional)} and run the command again will uninstall all Flash Player types on your system excluding Chrome(Flash Player update part of Chrome updater/installer) and Windows 8.x (Flash Player update part of Windows 8.x update) Also, I am curious as to why do you wish to clean all the registries as the update itself will manage all the data clean up and addition of new registries, which is part of the installation process. -- Piyush
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