You do not need to install Flash Player.
Use the following steps to troubleshoot Flash Player for Internet Explorer on Windows 10.
Open the page that has the rich media content in Internet Explorer. For example, visit Flash Player Help.
Click the Tools menu, in the upper-right corner of Internet Explorer.
Note:
Ensure that your current website has rich media content. If the current website does not contain rich media content, Shockwave Flash Object doesn't appear in the list.
Open the page that has rich media content in Internet Explorer.
Click the Tools menu and choose Safety > ActiveX Filtering.
Close the browser and open it. Then, try to view the content.
Have found out why we're not able to update to 11. Need at least 10.6 now, since Adobe is no longer dealing with older than that. Not fair, in my opinion.
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Adobe Flash Player for Mac lets you access Flash content in Web sites when using browsers like OS X's Safari. The plug-in integrates seamlessly and through a preference pane, gives you control over the type of access each Web site has to your system. The only downside to using it is that it suffers from performance issues.
Pros
Configurable: The plug-in adds a new preference pane in System Preferences where you will be able to adjust your local storage, camera, mic and peer-assisted networking settings to either allow the feature for all Web sites, on a per-request basis, or to deny all requests.
Per-site settings: All the features listed above support per-site settings for even more precise control.
Advanced options: The app lets you delete all Flash-related data and settings as well as audio and video license files, deauthorize the computer, and access trusted locations for developer testing.
Cons
Performance issues: Despite its long history with OS X, this software tends to slow down your computer and drain your battery.
Bottom Line
Update Flash Player
If you're constantly visiting Flash-based Web sites, you will have to install either this plug-in, or a browser like Google Chrome, which has built-in Flash support. Generally, the better way to go would be to use Chrome since there will be a lower performance impact on your system. But if Chrome is not your kind of browser, then this plug-in remains a viable solution for enjoying Flash content on your Mac.