Această eroare poate indica faptul că un alt proces este în conflict cu actualizarea.

When you attempt to install .NET Framework 3.5 or any other optional feature using “Windows Features” (optionalfeatures.exe) dialog or using DISM command-line, error 0x800F0954 may popup.

After enabling .NET Framework 3.5 and clicking OK, the following error may appear:

The same error may occur when attempting to install additional speech recognition or supplemental fonts using Optional features in the Settings page or using DISM command-line. For instance, you run the following command to install .NET Framework 3.5 from an elevated or administrator Command Prompt.

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All

After pressing ENTER, here is the full error message you might see:

The DISM.log file would show these entries/errors:

xxxx, Info                  DISM   DISM Package Manager: PID=12956 TID=12296 Further logs for online package and feature related operations can be found at %WINDIR%\logs\CBS\cbs.log - CPackageManagerCLIHandler::ExecuteCmdLine
xxxx, Error                 DISM   DISM.EXE: DISM Package Manager processed the command line but failed. HRESULT=800F0954

And the CBS.log file would have recorded these errors:

xxxx, Info                  CBS    DWLD:Failed to do Windows update search [HRESULT = 0x800f0954 - CBS_E_INVALID_WINDOWS_UPDATE_COUNT_WSUS]
xxxx, Info                  CBS    FC:   WindowsUpdateDownloadFromUUP returns. [0x800F0954]

Note that the error 0x800f0954 refers to CBS_E_INVALID_WINDOWS_UPDATE_COUNT_WSUS which indicates that your system might have been configured to use a WSUS server (on your domain network) to get updates instead of connecting to Windows Update servers directly.