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When installing softwares like E-prime or BrainVision Analyzer, we are
required to install .NET Framework 3.5 component. Although the process is straightforward and sometimes we already have the component previously installed, it is possible that the installation causes an error [error code 0x800F081F], specially if your laboratory computer uses Windows 10. Here we show you how to solve this issue.
First, you can check if the component is already installed on your device. Go to Control Panel > Programs > Turn Windows features on or off, verify if .NET
Framework 3.5 checkbox is selected and then proceed with the software installation.
If the error persits, we will have to force the installation with the Windows command prompt [CMD]. Prior to this step, we need to have the .NET Framework installation package in our device, which you can typically find on the 'Components' folder of the software we are trying to install [if you can't find in, it is also available for direct download on the Microsoft's website]. For now, you can leave the installation package on your local disk folder [C:\].
Go to Start Menu and type 'cmd' and open it with administrator privileges. Copy the following command on the prompt and execute it:
Dism.exe /online /enable-feature /featurename:NetFX3 /source:C:\
/LimitAccess
The prompt will display the installation progress. Once it finishes, run the software setup again and that's it.
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Runtime
Do you want to run apps? The runtime includes everything you need to run existing apps/programs built with .NET Framework.
Download .NET Framework 3.5 SP1 Runtime
If you're using Windows 10, Windows Server 2016, or Windows Server 2019, we recommend installing .NET Framework 3.5 through the control panel.
After you install security update 2966827 or 2966828 [described in Microsoft Security Bulletin MS14-046] for the Microsoft .NET Framework 3.5, and then you try to enable the
optional Microsoft .NET Framework 3.5 feature in Windows Features for the first time, the feature does not install. You may notice this failure if you "stage" the installation before you add the Microsoft .NET Framework 3.5 feature. When this problem occurs, you may receive an error message that resembles one of the following. Error code Error messages 0x800F0906 The source files could not be downloaded. Windows couldn't connect to the Internet to download necessary files. Make sure that you're connected
to the Internet, and click "Retry" to try again. Installation of one or more roles, role services, or features failed. 0x800F081F The source files could not be found. This problem occurs because security updates 2966827 and 2966828 for Microsoft Security Bulletin MS14-046 for the .NET Framework 3.5 require metadata that is added to the
system only if the Microsoft .NET Framework 3.5 feature is enabled on the system. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. The issue is now resolved by update 3005628. The workaround that is provided in the next section still unblocks customers, depending on their
situation. To resolve the issue, install update 3005628. To work around this issue, use one of the following workarounds, as appropriate for your situation: Symptoms
Use the "source" option to specify the location of the files that are required to restore the feature. For more information about specifying a source location, see //go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\Windows\Logs\DISM\dism.log
Windows couldn't complete the requested changes.
The source files could not be found. Try installing the roles, role services, or features again in a new Add Roles and Features Wizard session, and on the Confirmation page of the wizard, click "Specify an alternate source path" to specify a valid location of the source files that are required for the installation. The location must be accessible by the computer account
of the destination server.
0x800F0906 - CBS_E_DOWNLOAD_FAILURE
Use the "Source" option to specify the location of the files that are required to restore the feature. For more information about specifying a source location, see //go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\Windows\Logs\DISM\dism.log
0x800F081F - CBS_E_SOURCE_MISSING
Error code: 0x800F081F
Error: 0x800F081F Cause
Status
Workaround
Turn on the Microsoft .NET Framework 3.5 feature before you install security update 2966827 or 2966828. For more information about how to turn Windows features on or off, go to the following Microsoft webpage:
Turn Windows features on or offYou can also use Deployment Image Servicing and Management [DISM] or any supported managed update system to add the Microsoft .NET Framework 3.5 feature. For more information about how to deploy the .NET Framework 3.5 by using DISM, go to the following Microsoft webpage:
Deploy .NET Framework 3.5 by using Deployment Image Servicing and Management [DISM]
If security update 2966827 or 2966828 has already been installed on the system, temporarily uninstall the update, enable .NET Framework 3.5, and then reinstall the security update.
If you see this behavior from Windows Server Update Services [WSUS], Microsoft Intune, or System Center Configuration Manager environments, refer to the following documentation:
To build a supported repair feature configuration environment: //technet.microsoft.com/en-us/library/jj127275.aspx
To configure a Windows repair source: //technet.microsoft.com/en-us/library/hh825020.aspx
More Information
The information in this article applies to:
The Microsoft .NET Framework 3.5