Adobe stopped supporting Flash Player beginning December 31, 2020. After this data, Adobe will not release new Flash Player updates or security patches and strongly recommends the users to uninstall Flash Player immediately from their machines. To help secure your system, major browser vendors have already disabled Flash Player from running.
As part of the end of support for Adobe Flash, KB4577586 is now available as an optional update from Windows Update (WU) and Windows Server Update Services (WSUS). Installing KB4577586 will remove Adobe Flash Player permanently from your Windows device. Once installed, you cannot uninstall KB4577586. This update only removes Adobe Flash Player that was installed by your version of Windows. If you installed Adobe Flash Player manually from another source, it will not be removed.
Ref : https://support.microsoft.com/en-us/topic/kb4577586-update-for-the-removal-of-adobe-flash-player-october-27-2020-931521b9-075a-ce54-b9af-ff3d5da047d5