Firstly, there is no need to post the same issue 3 times, 3 minutes apart. These forums are user-to-user forums and monitored by employees during working hours, when time permits. It's not reasonable to expect an reply within 3 minutes. I have deleted your other two duplicate posts.
Microsoft embeds Flash Player in IE and Edge browsers in Windows 10. If you're referring to either of these browsers, there is nothing to install. If Flash is not working in one, or both, of these browsers, please see:
- Flash Player Issues | Windows 10 | Internet Explorer
- Adobe Flash Player issues with Windows 10 (Microsoft Edge)
Also ensure that you have the latest video drivers installed on your system.
If your favorite website is telling you to install Flash Player while using IE or Edge, the following should be helpful:
First, confirm that ActiveX Filtering is configured to allow Flash content:
You can try to work around these issues by using Compatibility View:
If that is too inconvenient, using Google Chrome may be a preferable alternative.