When you’re installing Windows Server 2016 Technical Preview 5, don’t forget to install KB3157663 before installing any server roles, features, or other products. Installing KB3157663 prior to any other software will fix an error with DISM and Install-WindowsFeature, error code 0x800F081F:

Error: 0x800f081f

The source files could not be found.
Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.

The DISM log file can be found at C:\Windows\Logs\DISM\dism.log

KB 3157663 is a required cumulative update for Windows Server 2016 TP5. Not installing this update will result in errors when trying to install additional software, for example the .NET 3.5 Framework using either DISM or Install-WindowsFeature:

PS: C:\>DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /source:\\share\os\2016\sources\sxs /LimitAccess
Install-WindowsFeature Net-Framework-Core

Unfortunately, there is no clear reference to this in the cumulative update summary:


This security update includes improvements and fixes in the functionality of Windows Server 2016 Technical Preview 5, and it resolves the following vulnerabilities:

  • 3148532 MS16-038: Cumulative security update for Microsoft Edge: April 12, 2016
  • 3148522 MS16-039: Security update for Microsoft Graphics Component: April 12, 2016
  • 3148541 MS16-040: Security update for Microsoft XML core services: April 12, 2016
  • 3148538 MS16-046: Security update for secondary logon: April 12, 2016
  • 3148527 MS16-047: Security update for SAM and LSAD remote protocols: April 12, 2016
  • 3148528 MS16-048: Security update for CSRSS: April 12, 2016

The package for the x64 version is 89.7 MB.

Fortunately it is mentioned in the Windows Server 2016 TP 5 Release Notes:

Install Cumulative Update for Windows Server 2016 Technical Preview 5 (KB3157663) before installing any server roles, features, or other products. If you install roles before installing the update, a variety of issues can occur. If this happens, reinstall the preview release and then immediately install the update.

Always keep this in mind 😉 However, this is no longer required with Windows Server 2016 RTM, so it seems.

This may interest you:   How to verify SMBv1 is disabled in Windows and Windows Server