SET FLASHDIR32=\System32\Macromed\Flash\
SET FLASHDIR64=\SysWOW64\Macromed\Flash\

for /f "delims=|" %%f in ('dir /b %WINDIR%%FLASHDIR32%FlashUtil*_Plugin.exe') do %WINDIR%%FLASHDIR32%%%f -update plugin
for /f "delims=|" %%f in ('dir /b %WINDIR%%FLASHDIR64%FlashUtil*_Plugin.exe') do %WINDIR%%FLASHDIR64%%%f -update plugin

pause