I have Adobe Shockwave Flash version 11.5.502.146 and version 11.8.800.94 and I want to delete the older one? my browser says it's vulnerable to update and I did now I have both.
Use the uninstaller, then reinstall the latest version.
Mac OS: http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html
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