Microsoft quietly revealed their plans to remove the Adobe Flash plugin from Windows 10. The KB4577586 update will be mandatory removal starting in July 2021. Microsoft previously stated that they would distribute it through WSUS and Windows Update in the future. With Windows 10 currently running on 1.3 billion devices, after the July 2021 updates, a massive number of devices will be clean from Adobe Flash Player. Microsoft has outlined their further plans on how they will begin distributing the update in June 2021, starting in their optional Windows 10 preview cumulative updates for Windows 10 1809 and later.
Source: https://www.bleepingcomputer.com/news/security/microsoft-reveals-final-plan-to-remove-flash-player-in-windows-10/