As of Windows 8, Microsoft embeds Flash Player in Internet Explorer and in Edge as of Windows 10. Due to this all updates are delivered via Windows Updates by Microsoft and a separate standalone installer is not available. Please run Windows Update to get the latest version. It's possible you may need to run Windows Update a few times to install prior updates before certain updates become available for installation.
These pages contain a list of all Flash Player updates for Windows 8 and above:
Note that prior to February 2016 Flash Player Updates for IE (and Edge) were named "Update for Vulnerabilities in Adobe Flash Player in Internet Explorer and Microsoft Edge". As of February, Microsoft names the update "Security Update for Flash Player'
If you do not see the Flash Player update, please contact Microsoft to find out why the update is not being made available to you.