Updating flash on older mac
APPLE-SA-2015-02-05-1 OS X: Flash Player plug-in blocked Due to security issues in older versions, Apple has updated the web plug-in blocking mechanism to disable all versions prior to Flash Player 18.104.22.1685 and 22.214.171.1249.
Last summer, Apple pulled a similar move and blocked all outdated versions of Adobe Flash in Safari due to similar vulnerabilities.
Plug-ins like Adobe Flash Player have long been an issue for Apple, requiring forced updates and security fixes to patch vulnerabilities.
When vulnerabilities arise, Apple has been consistent in blocking older versions of the web plug-ins.
Apple is looking to reduce the risk of potential issues with mac OS Sierra, in which Safari will deactivate Flash Player and other plug-ins by default in an effort to push the more modern HTML5.
To continue using Flash, users must download the latest Adobe Flash Player update from Adobe's website.
Mac users who primarily browse the web with Safari will eventually notice the “Flash out-of-date” message appearing somewhere in the browser.