Below are all direct download links for the new Adobe Flash Player 11, for both 32-bit & 64-bit systems, both Windows & Mac OS. Mac users will be notified of the new version automatically by OS X's Software Update, while Windows users already running Safari will be alerted by a separate tool bundled with the browser. Adobe Flash Player for the Mac is a plug-in, not a Mac OS X application. When you try to uninstall Adobe Flash Player from your Mac, you might find that this plug-in is not so easy to delete. For example, you might see this message.
Apple today has confirmed that is updating its web plug-in blocking mechanism in OS X to disable all versions of Adobe Flash Player prior to the most recent, which is version 17.0.0.169. On older systems, all versions of Flash prior to 13.0.0.281 are blocked.

Apple notes on its Support page that if you must run an older version of Flash in Safari, you can do so by using the Internet plug-in management option in the browser. With this option, you can choose to run the Flash Player plug-in in unsafe mode on websites that you trust.
Apple cites security issues for its reasoning to block old versions of Adobe Flash:
Flash Player For Ipad
Due to security issues in older versions, Apple has updated the web plug-in blocking mechanism to disable all versions prior to Flash Player 17.0.0.169 and 13.0.0.281.

Adobe Flash Player Mac Os X Yosemite

Flash Player For Safari Mac
This isn’t the first time Apple has taken steps to block potentially insecure versions of Adobe Flash on its machines. Last summer, Apple pulled a similar move and blocked all outdated versions of Adobe Flash in Safari due to similar vulnerabilities.
The most recent version of Flash Player is available on Adobe’s website.