Summary
This update provides a compatibility fix to Windows Setup in Windows 10, version 2004, 20H2, and 21H1. This compatibility fix enables an in-place upgrade to be run on devices that cannot complete the installation of the latest cumulative update (LCU).
Known issues in this update
We are currently not aware of any issues that affect this update.
How to get this update
Microsoft Update Catalog
| Release Channel | Available | Next Step |
|---|---|---|
| Microsoft Update Catalog | Yes | To get the standalone package for this update, go to the Microsoft Update Catalog website. |
| Windows Server Update Services (WSUS) | Yes | You can import this update into WSUS manually. For more information, see the Frequently Asked Questions topic on the Microsoft Update Catalog website for instructions. |
Prerequisites
There are no prerequisites to apply this update.
Restart information
You don't have to restart your computer after you apply this update.
Update replacement information
This update does not replace any previously released update.
File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
For all supported x86-based systems
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| sysmain.sdb | Not versioned | 16-Aug-2021 | 21:25 | 3,873,652 |
| AcRes.dll | 10.0.19041.1255 | 16-Aug-2021 | 21:25 | 332,616 |
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:48 | 86,528 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:43 | 381,440 |
For all supported x64-based systems
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| sysmain.sdb | Not versioned | 17-Aug-2021 | 1:12 | 4,060,054 |
| AcRes.dll | 10.0.19041.1255 | 17-Aug-2021 | 1:12 | 332,624 |
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 5:05 | 15,872 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 4:47 | 326,144 |
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:48 | 86,528 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:43 | 381,440 |
For all supported Arm64-based systems
| File name | File version | Date | Time | File size |
|---|---|---|---|---|
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 1:45 | 32,768 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 1:45 | 32,768 |
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:48 | 86,528 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 0:43 | 381,440 |
| sysmain.sdb | Not versioned | 16-Aug-2021 | 22:03 | 4,059,266 |
| AcRes.dll | 10.0.19041.1255 | 16-Aug-2021 | 22:03 | 332,624 |
| AcXtrnal.dll | 10.0.19041.1255 | 17-Aug-2021 | 2:13 | 12,800 |
| AcLayers.dll | 10.0.19041.1255 | 17-Aug-2021 | 2:13 | 15,872 |
References
Learn about the terminology that Microsoft uses to describe software updates.