Microsoftwindowsnetfx3ondemandpackagecab Download Server 2012 R2 New ((link)) [ Cross-Platform ]

Usually not, but a reboot is recommended for full system consistency.

Do not download CAB files from random third-party DLL websites. They are often outdated, corrupted, or injected with malware. Always source from Microsoft directly. Usually not, but a reboot is recommended for

Microsoft does not offer a standalone direct download for just the CAB file. You must extract it from an official ISO. However, you can use the DISM /Online /Enable-Feature /FeatureName:NetFx3 /All without any source – this forces Windows Update. Only use that if your server has internet access. Always source from Microsoft directly

/LimitAccess : Prevents DISM from trying to contact Windows Update. However, you can use the DISM /Online /Enable-Feature

DISM works even if the GUI "Add Roles" wizard fails.

If you have already extracted the specific .cab file (usually named microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab ) from the sources\sxs folder and placed it on your desktop (for example), you can install it using the Deployment Image Servicing and Management (DISM) tool.

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