It’s been a while since Microsoft began rolling out Windows 10 KB4054517 (Build 16299.125) to the general public. Not everyone has had a smooth upgrade, many users on Microsoft community forum reports about error 0x80070643 while updating the system to KB4054517 (Build 16299.125).
According to the reports, Windows 10 KB4054517 fails to install with error 0x80070643. Today, Microsoft has finally acknowledged that a bug in Windows 10 Fall Creators Update is preventing the system from installing the latest cumulative release. Microsoft is aware of not one, but two bugs preventing the installation of the latest cumulative update.
How to fix error 0x80070643 while installing KB4054517 (Build 16299.125)
Error 0x80070643 is a result of a bug where Windows Update might incorrectly report that the cumulative update has failed to install. Before following any workaround, Microsoft recommends affected users to check “About your PC section” in Settings and verify whether your device is running build 16299.125 or not.
Windows 10 KB4054517 installation stuck at 99%
If the Windows 10 KB4054517 installation is stuck at 99%, Microsoft recommends users to download KB4054022 and follow the below steps:
- Move the downloaded KB4054022 to c:\temp.
- Open Command Prompt with administrative rights.
- Expand the .msu file and run the command:
expand -f:* windows10.0-kb4054022-x64.msu c:\temp
- Use Deployment Image Servicing and Management tool to install KB4054022:
taskkill /f /im tiworker.exe
taskkill /f /im trustedinstaller.exe
dism /online /add-package /packagepath:c:\temp\Windows10.0-KB4054022-x64.cab
- If you wish to delete the CBS logs, you can do so by:
del /f %windir%\logs\cbs\*.log
If nothing works, you can download the offline installer of the latest cumulative update and upgrade your machine. It’s worth noting that Microsoft is working on a permanent fix but it’s likely that the fix will be available on next Patch Tuesday.