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Ensure your ISO matches the exact build architecture (64-bit) and language of your OS. The system cannot find the file specified.
Press . DISM will proceed with the installation and should complete successfully within a few minutes.
Processing 1 of 1 - Adding package Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~6.3.9600.16384 [==========================100.0%==========================] The operation completed successfully.
Forget the bloated ISO mounts and failed wizards. With a valid, digitally signed .cab file and the DISM commands outlined in this guide, you can install .NET Framework 3.5 on Windows Server 2012 R2 in under two minutes—cleanly, silently, and reliably. Ensure your ISO matches the exact build architecture
The most reliable method to fix this "file not found" error is to use the Deployment Image Servicing and Management (DISM) tool. You will need access to a Windows Server 2012 R2 ISO file or a USB/DVD drive.
: If you do not have the physical media, you can download the Windows Server 2012 R2 ISO from the Microsoft Volume Licensing Service Center (VLSC) Evaluation Center PowerShell script
| Issue | Solution | |-------|----------| | (Source not found) | Ensure the CAB is not renamed; use exact filename. Provide folder path, not file path. | | Error 0x800f0906 (Cannot download) | Add /limitaccess to DISM to block Windows Update attempts. | | DISM fails with 0x800f0950 | The CAB may be corrupt. Re-download from Microsoft Update Catalog and verify hash. | | Installation appears successful but .NET apps fail | Reboot the server. Some NetFx3 components require a restart. | DISM will proceed with the installation and should
Enable-WindowsOptionalFeature -Online -FeatureName "NetFx3" -All -Source "C:\Temp"
Copy the file to a simple path on your target server, e.g., C:\Temp\NetFx3.cab . Avoid spaces in the path to prevent command-line parsing errors.
PowerShell offers a more integrated way to handle the installation: Install-WindowsFeature Net-Framework-Core -Source D:\sources\sxs Best Practices for "New" Server Setups With a valid, digitally signed
There are three reliable methods to obtain the correct microsoft-windows-netfx3-ondemand-package.cab file for your operating system version.
This is the user-friendly approach if you have a graphical interface.