Adobe Flash Player

If you really need to run Flash, make sure you go to the official site to download and install it

ADOBE’S FLASH PLAYER plug–in isn’t included with macOS, and is disabled in Safari by default. That’s because it’s pretty much obsolete and provides a handy attack vector for malware. But if you need to use a website that requires Flash, you may have to install it.

You’ll be warned about this in your browser by an alert that links to the required plug–in, but it’s wise not to get into the habit of clicking software install alerts on web pages, since they can be fake. Instead, check whether Flash Player is already installed by going to System Prefs. Press Cmd+L to show all panes, and look for a Flash Player icon at the bottom.

If it’s there, click it and check its settings and that it’s updated. Then go to Safari > Preferences > Websites, select Plug–ins on the left, enable Adobe Flash Player and, with this selected, set "When visiting other websites" to Ask. (In OS X 10.10 and earlier, plug–in settings are in the Security tab of Safari’s preferences.)

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If you don’t have Flash Player, head to get.adobe.com/flashplayer by typing that address into your browser. It’s important that you don’t try a search: the first Google result we got for "install Flash on Mac" was a paid ad link to a fake site offering "Abode Flash Player".

Such links can trick you into installing adware or malware. From the official site, download Adobe’s installer and run it, then enter your admin password when prompted to install the plug–in. You may still need to enable it in Safari.