This decision has been made considering the catastrophic implications it could have if mistakenly deployed to devices where applications may need Adobe Flash Player to work properly. The latter is currently available in Windows Insider Program with some minor updates to be added and shipped in the coming weeks.Due to the nature of KB4577586 which causes the removal of Adobe Flash Player from target devices, this update will not be offered through the KACE Patch Catalog. Windows 10 will also automatically remove Flash and all associated files when users update their system to the latest version, 21H1. Users, who can’t wait for the new update, can download and install the KB4577586 patch manually by going to Windows Update Catalogue. Microsoft releases optional 'C-updates' on the third and fourth week of every month where it allows its users to test patches before shipping them publicly next month. It not only removes Flash from Windows but also prevents future installation, keeping users safe from the old technology's bugs and security holes. This will be included in every 'Patch Tuesday' for supported Windows versions. 'Update for Removal of Adobe Flash Player' will become mandatory as part of monthly updates (cumulative) for all Windows 10 and Windows 8.1 versions from July 2021. It will be optional which means that the users can keep using Flash for some time. In June 2021, the Preview Update for Windand newer will include the KB4577586 by default. However, that update was optional, and users could block it from being installed on their computers. The company issued an update in February, referred to as the KB4577586 update, that allowed uninstalling the Flash Player on Windows 10 or Windows server. It is an optional feature that lets the users choose when to eliminate Flash from their systems. Back in October 2020, Microsoft allowed selective users to remove Flash from supported Windows versions by offering them a patch.

Microsoft kb4577586