Download And Install KB4577063 Windows 10 Preview Update For October 2020 [Version 2004]

Microsoft has recently released a preview cumulative update for all editions of Windows 10 v2004, the KB4577063. This is an optional update which means that it will not be installed automatically, and will require manual input to download and install it on your system running Windows 10 version 2004.

KB4577063 was also previously released in the Windows Insider Program for Windows 10 v20H2 in the Beta and the Release Preview channels and has now made its way as a public release for version 2004.

After installing the KB4577063 cumulative update in Windows 10 v2004, the build number will change to 19041.546.

Since it is a preview release, it has not been made mandatory for everyone to install on their systems. Let us see what improvements this update has to offer to a regular user, and whether or not it is worth installing.

What’s new in KB4577063

As this release is a preview, there are no release notes as of yet. This is a non-security update that addresses a series of glitches that needed fixing in Windows 10.

The highlights of this update for v2004 are:

  • Added a notification to Internet Explorer 11 informing the users about the End of Support for Adobe Flash in December 2020.
  • Fixes an issue where games using spatial audio stop functioning.
  • Reduces distortions in Windows Mixed Reality head-mounted displays.
  • Changes to the default refresh rate to 90 Hz of the head-mounted display meeting the minimum criteria.
  • More Windows Mixed Reality motion controllers are now supported.

Some of the significant improvements and fixes in KB4577063 for version 2004 are:

  • Addresses an issue that prevents the language bar from appearing when signing into a new session, even though it is configured properly.
  • Fixes an issue that prevents users from connecting to a previously closed session in an unrecoverable state.
  • Fixes an issue when configuring profile cleaning Group Policy Object, it prevents stale profiles from being removed.
  • Addresses an issue where clicking I forgot my PIN fails to perform in Windows Hello for Business On-Premise deployment.
  • Fixes an issue where a customer’s workload cannot be monitored by Microsoft’s System Center Operations Manager (SCOM).
  • Addresses a problem when random line-breaks occur in Windows PowerShell when you redirect console error output.
  • Fixes an issue when generating HTML reports using tracerpt.
  • Allowed the DeviceHealthMonitoring Cloud Service Plan (CSP) to now run on Windows 10 Professional and Business editions.
  • Addresses an issue that prevents cryptographic registries from being carried over during Windows feature updates.
  • Fixes some issues with Windows Defender Application Control.
  • Fixes an issue where the user is prompted that the smart card PIN change was not successful, whereas it had changed successfully.
  • Updated support for different wavelength cameras for Windows Hello Face recognition.
  • Addresses a problem with the Hyper-V host where it stopped working when a Small Computer System Interface (SCSI) command was executed.
  • Addresses an issue when applications fail to launch or cause other problems when the Notification Tray displays “no internet access.”
  • Fixes an issue where Microsoft Intune fails to connect to devices connected via Virtual Private Network version 2 (VPNv2).
  • Devices will now suspend uploads and downloads with peer connections when a VPN connection is detected.
  • Addresses and fixes a bunch of Active Directory and Lightweight Directory Access Protocol (LDAP) issues.
  • Fixes the issue which causes Isass.exe to stop working, which leads to an automatic reboot of the system.
  • Added an Azure Active Directory (AAD) token which was sent to Windows Update as part of the update scan.
  • Fixes a problem with the Windows Subsystem for Linux (WSL) that results in an “element not found” error.

For more elaborate information on KB4571744, check out this Microsoft help page.

Install KB4577063 using Windows Update

The size of this update is around 344MB. It is recommended to download and install it when there is less traffic on your network, and the computer’s resources are less occupied.

As it is a cumulative update, only installing KB4577063 would install all previous pending updates.

Since the preview version is not a mandatory update, this needs to be installed manually.

  1. Navigate to the following:
    Start Menu –> Settings –> Update & Security –> View optional updates
  2. Now expand Other Updates and check the box next to the available 2020-09 Cumulative Update Preview KB4571744.
  3. Now click on Download and Install.
    download and install

The update will begin to download and install, and should be completed shortly.

Download KB4577063 Offline installers

The update can also be installed on any computer having Windows 10 Version 2004 without having an internet connection. Download the offline installers below:

Download KB4577063 for Windows 10 Version 2004 64-bit [344.3 MB]

Download KB4577063 for Windows 10 Version 2004 32-bit [113.6 MB]

To download any other updates related to KB4577063, please check the Microsoft Catalog.

To install the update, simply run the downloaded MSU file and Windows will automatically install the cumulative update.

You can check out your current Windows build by going to Run and then type winver.


Issues related to KB4577063

Microsoft is aware and acknowledged that this update might have a few errors that still need some fixing-up. The users of Microsoft Input Method Editor (IME) for Japanese and Chinese languages might experience some problems while inputting text, or while viewing its results, such as not being able to enter text entirely, or receive unexpected results.

Some of the errors from KB4577063 have already been addressed, and Microsoft has shared their workarounds for the issues.

Uninstall KB4578063 cumulative preview update

If this update creates issues for your system, you can easily uninstall it using the following two ways:

Uninstall KB4577063 using Windows Update History tool

  1. Navigate to the following:
    Start Menu -> Settings –> Update & Security –> Windows Update.
  2. From the right-hand pane, click on View Update History.
  3. Now click on Uninstall updates.
  4. Select Update for Microsoft Windows (KB4577063) and press the Uninstall button.

Uninstall KB4577063 using command-line

You can also delete the update by entering several commands in the Command Prompt. Here is how:

  1. Launch the Command Prompt by typing cmd in Run.
  2. Run the following command:
    wmic qfe list brief /format:table
  3. This will show all the updates installed on the computer. Make sure KB4577063 is on the list.
  4. To uninstall the update, run the following command
    wusa /uninstall /kb:4577063

Restart the computer once the update is uninstalled.

Cleanup after installing Windows Updates

If you want to save space after installing Windows updates, you can run the following commands:

dism.exe /Online /Cleanup-Image /AnalyzeComponentStore
dism.exe /Online /Cleanup-Image /StartComponentCleanup
Windows image cleanup

Subhan Zafar

Subhan holds a degree in Electrical Engineering and has completed several system and network certifications including Huwaei, Cisco and Microsoft certs. He mostly researches and writes about the Windows world.

One thought on “Download And Install KB4577063 Windows 10 Preview Update For October 2020 [Version 2004]

  1. After having installed kb4577063 on Windows 10 x64 desktop PC, my computer does no longer auto-restart after a power outage (the corresponding bios option was set correctly). After having uninstalled kb4577063, the computer restarts again correctly, when I switch off the power supply and switch it on again afterwards. So, presumalby, it might be a bug in kb4577063.

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