KB4577586 Update for removal of Adobe Flash Player - Oct. 27


Update for the removal of Adobe Flash Player: October 27, 2020

Applies to: Windows 10 version 1909 all editions, Windows 10 version 1903 all editions, Windows Server 2019 all editions, Windows 10 version 1809 all editions, Windows Server version 1809, Windows 10 version 1803 all editions, Windows Server version 1803, Windows 10 version 1709 all editions, Windows Server version 1709, Windows 10 version 1703 all editions, Windows Server 2016, Windows 10 version 1607 all editions, Windows 10, Windows Server 2012 R2, Windows RT 8.1, Windows 8.1, Windows Server 2012

Important notes
  • Adobe Flash Player will go out of support on December 31, 2020. For more information, see Adobe Flash end of support on December 31, 2020.
  • Applying this update will remove Adobe Flash Player from your Windows device.
  • After this update has been applied, this update cannot be uninstalled.
  • We are releasing this removal update in advance of end of support to help customers test and validate their environments for any impact that might occur by the removal of Adobe Flash Player. Also, if another security update for Adobe Flash Player is released, customers who take this removal update will still be offered the security update.
  • 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. For more information about how to remove Adobe Flash Player, see the Uninstall Flash Player | Windows topic on the Adobe website.


This update removes Adobe Flash Player that is installed on any of the Windows operating systems that are listed in the "Applies to" section. After you apply this update, it cannot be uninstalled.

Note If you must use Adobe Flash Player again on your device after this update has been installed, use one of the following methods:
  • Method 1: Reset your device to an earlier system restore point. This feature must be explicitly enabled and a system restore point must have been created on your Windows device before you apply this update.

    For more information about system restore point, see Back up and restore your PC.
  • Method 2: Reinstall your Windows operating system, but do not apply this update.
Known issues in this update

When this update is applied, registry settings for the third-party provided version of Adobe Flash Player may be removed.To resolve this issue, reinstall the third-party version.

How to obtain and install the update

Windows Update

This update is an optional update in Windows Update.

Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Service

This update is currently not available in Windows Server Update Service (WSUS). It will be made available in early 2021.

Note You can import this update into WSUS manually. See The Microsoft Update Catalog Site topic on the Microsoft Docs website for instructions.


Learn about the terminology that Microsoft uses to describe software updates.

Source: KB4577586: Update for the removal of Adobe Flash Player: October 27, 2020


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Known issues updated for KB4577586. See first post for more details. :)

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