Run the MSI, downloaded from here: http://www.adobe.com/de/products/flashplayer/distribution3.html, manually on one or two Testclients. If it fails, you can download the UninstallFlashplayer.exe and try to deinstall FlashPlayer. https://helpx.adobe.com/de/flash-player/kb/uninstall-flash-player-windows.html After this, try install again through Windows Update.
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