KB4577063 is the optional patch update for Windows 10 v2004 users. Here're the download links for that KB4577063 offline installer.

Directly on the first of October, Microsoft released an optional patch update for those Windows 10 v2004 users. Becoming an optional update, it is a non-security update. That being said, of course, the KB4577063 update is stuffed with lots of improvements and fixes to enhance the quality of life of Windows 10. This update brings the much-needed fix for spatial audio in games and aberrations & distortions in Windows Mixed VR headsets. Another fixes include although not limited to Ie 11, language recognition, time-zone updates, Windows Hello face recognition, plus much more.

Overall, the KB4577063 update comes complete with a lot of stuff to improve Windows 10 v2004. That said, considering the current history of the Windows 10 optional updates, I'll recommend you to definitely wait per week or so before installing the update. In the meantime, Microsoft will iron out any bugs and imperfections that might cause system stability issues.

Of course, you can install the KB4577063 update in the Settings app. Alternatively, if you want to install the update on an offline computer or maybe you've disabled Windows 10 auto-update, download the KB4577063 offline installer using the links given below.

Download Links for KB4577063 Offline Installer

Fundamental essentials download links for KB4577063 update offline installer.

KB4577063 For Windows 10 v2004 users:

KB4577063 32-bit (x86) offline installer (113.6 MB)
KB4577063 64-bit (x64) offline installer (344.3 MB)

Based on your operating system version, click the appropriate link to download the installer. Along with the above links, you may also make use of the MS Update Catalog web site to download the update's offline installer.

KB4577063 Changelog

Adds a notification to Ie 11 that informs users about the end of support for Flash in December 2020. To learn more, see KB4581051.
Addresses a problem with Microsoft Edge IE Mode that occurs when you enable Configure enhanced hang detection for Ie mode in Microsoft Edge.
Addresses an element that, sometimes, prevents the Language Bar from appearing when the user signs in to a new session. This occurs even though the Language Bar is configured properly.
Addresses an issue that fails to recognize the first East Asian language character typed into a Microsoft Foundation Class Library (MFC) DataGrid.
Addresses an issue the prevents you from reconnecting to some previously closed session because that session is within an unrecoverable state.
Addresses an element that causes games which use spatial audio to prevent working.
Addresses an issue that prevents the deletion of stale user profiles whenever you configure a profile cleanup Group Policy object (GPO).
Addresses an issue by which selecting I forgot my Pin from Settings>Accounts>Sign-in options fails in a Windows Hello for Business On-Premise deployment.
Updates 2021 time zone information for Fiji.
Addresses an element that affects the Microsoft's System Centre Operations Manager's (SCOM) capability to monitor a customer's workload.
Addresses an issue that causes random line breaks when you redirect PowerShell console error output.
Addresses an issue with creating HTML reports using tracerpt.
Allows the DeviceHealthMonitoring Cloud Service Plan (CSP) to operate on Windows 10 Business and Windows 10 Pro editions.
Addresses an element that prevents the content under HKLM\Software\Cryptography from being carried over during Windows feature updates.
Addresses an element that causes an access violation in lsass.exe when a process begins while using runas command in certain circumstances.
Addresses a problem by which Windows Defender Application Control enforces package family name rules that needs to be audit only.
Addresses an element that displays an error that states that the smart card PIN change wasn't successful although the PIN change was successful.
Addresses an element that could create duplicate Foreign Security Principal directory objects for Authenticated and Interactive users in the domain partition. Consequently, the initial directory objects have "CNF" added to their names and therefore are mangled. This problem occurs when you promote a new domain controller using the CriticalReplicationOnly flag.
Updates the configuration of Windows Hello Face recognition to be effective with 940nm wavelength cameras.
Reduces distortions and aberrations in Windows Mixed Reality head-mounted displays (HMD).
Ensures that new Windows Mixed Reality HMDs meet minimum specification requirements and default to a 90Hz refresh rate.
Addresses an issue that causes a stop error on a Hyper-V host whenever a virtual machine (VM) issues a specific Small Computer Interface (SCSI) command.
Addresses an element that might cause attempts to bind an outlet to some shared socket to fail.
Addresses an issue that might prevent applications from opening or cause other errors when applications use Windows APIs to check on for internet connectivity and also the network icon incorrectly displays "No internet access" in the notification area. This problem occurs if you use a group policy or local network configuration to disable active probing for that Network Connectivity Status Indicator (NCSI). This also occurs if active probing does not make use of a proxy and passive probes fail to detect internet connectivity.
Addresses an element that prevents Microsoft Intune from syncing on the device using the virtual private network version 2 (VPNv2) configuration company (CSP).
Suspends uploads and downloads from peers whenever a VPN connection is detected.
Addresses an element that prevents Microsoft Internet Information Services (IIS) management tools, for example IIS Manager, from managing an ASP.NET application which has configured SameSite cookie settings in web.config.
Addresses a problem with ntdsutil.exe that stops you against moving Active Directory database files. The error is, "Move file failed with source <original_full_db_path> and Destination <new_full_db_path> with error 5 (Access is denied.)"
Addresses an issue that incorrectly reports that Lightweight Directory Access Protocol (LDAP) sessions are unsecure in Event ID 2889. This happens when the LDAP session is authenticated and sealed with a Simple Authentication and Security Layer (SASL) method.
Addresses an issue that may cause Windows 10 devices that enable Credential Guard to fail authentication requests once they make use of the machine certificate.
Restores the constructed attribute in Active Directory and Active Directory Lightweight Directory Services (AD LDS) for msDS-parentdistname.
Addresses an element that causes queries against large keys on Ntds.dit to fail using the error, "MAPI_E_NOT_ENOUGH_RESOURCES." This issue may cause users to see limited meeting room availability since the Exchange Messaging Application Programming Interface (MAPI) cannot allocate additional memory for the meeting requests.
Addresses an issue that intermittently generates Online Certificate Status Protocol (OSCP) Responder audit events (5125) to point that a request was submitted to the OCSP Responder Service. However, there is no reference to the serial number or the website name (DN) from the issuer from the request.
Addresses an element that displays strange characters prior to the day, month, and year fields in the output from console commands.
Addresses an element that causes lsass.exe to stop working, which triggers a restart of the system. This problem is the place invalid restart data is sent having a non-critical paged search control.
Addresses an element that does not log events 4732 and 4733 for Domain-Local group membership alterations in certain scenarios. This occurs if you use the "Permissive Modify" control; for example, the Active Directory (AD) PowerShell modules use this control.
Addresses a problem with the Microsoft Cluster Shared Volumes File Systems (CSVFS) driver that prevents Win32 API access to SQL Server Filestream data. This occurs when the information is stored on the Cluster Shared Volume inside a SQL Server failover cluster instance, which is on an Azure VM.
Addresses an element that causes a deadlock when Offline Files are enabled. Consequently, CscEnpDereferenceEntryInternal holds parent and child locks.
Addresses an element that causes deduplication jobs to fail with stop error 0x50 when you call HsmpRecallFreeCachedExtents().
Addresses an issue that causes applications stop working once they use Microsoft's Remote Desktop sharing APIs. The breakpoint exception code is 0x80000003.
Removes the HTTP call to microsoft.com the Remote Desktop Client (mstsc.exe) makes at sign out when utilizing an online Desktop Gateway.
Addresses an issue with evaluating the compatibility status from the Windows ecosystem to help ensure application and device compatibility for those updates to Windows.
Adds support for several new Windows Mixed Reality motion controllers.
Addresses an issue that causes apps which use Dynamic Data Exchange (DDE) to stop responding whenever you make an effort to close the app.
Adds an Azure Active Directory (AAD) Device Token that's delivered to Windows Update (WU) as part of each WU scan. WU can use this token to query for membership in groups with an AAD Device ID.
Addresses a problem with setting the "Restrict delegation of credentials to remote servers" Group Policy with the "Restrict Credential Delegation" mode on the Remote Desktop Protocol (RDP) client. As a result, the Terminal Server service tries to use "Require Remote Credential Guard" mode first and will just use "Require Restricted Admin" if the server doesn't support "Require Remote Credential Guard".
Addresses an issue in Windows Subsystem for Linux (WSL) that generates an "Element not found" error whenever you try to start WSL.
Addresses a problem with certain WWAN LTE modems that may show no internet connection in the notification area after waking from sleep or hibernation. Additionally, these modems may not be able to connect with the web.