How to Fix Error 0x800f081f (Source Files Not Found)
By Ethan Walker
· About Zone Desire
Quick answer
Error 0x800f081f means Windows could not find the source files needed to install a feature, most often .NET Framework 3.5, or to repair Windows with DISM. Install .NET 3.5 through Windows Features while online, or point DISM to a Windows ISO as the source.
What does “0x800f081f” mean?
Windows needs extra files that are not on the PC and could not download them.
What causes it?
- Installing .NET Framework 3.5 without internet
- Group Policy blocks Windows Update as a source
- Corrupted component store
Steps to try
Stop when the issue is resolved.
- Connect to the internet and disconnect any VPN.
- Open Control Panel → Programs → Turn Windows features on or off.
- Tick .NET Framework 3.5 and click OK, then choose Let Windows Update download the files.
- If it fails, mount a Windows ISO of the same version (for example as drive D:).
- Run in admin Command Prompt: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess
- Restart the PC.
Need more support? Check the official help: Microsoft Support
FAQs
Where do I get the Windows ISO?
Download it from Microsoft's official Download Windows page using the Media Creation Tool or the ISO option.
Is 0x800f081f the same as 0x800f0906?
They are related. Both mean DISM or Windows could not get the needed source files.