You can also download the offline installer files directly from Microsoft:
Can be deployed via Command Prompt (CMD) or PowerShell for enterprise environments. Pros & Cons offline install.NET 3.5 with Windows 10 - Server Fault
dism /online /enable-feature /featurename:netfx3 /all /source:D:\sources\sxs /limitaccess You can also download the offline installer files
If the basic installer fails, you can use a Windows 10 or 11 ISO file (the "offline installer") to enable the feature via the command line. Microsoft .NET Framework 3.5 Service pack 1 (Full Package)
: Search for cmd in the Start menu, right-click it, and select Run as administrator . If you are in an environment without internet
If you are in an environment without internet access or have encountered errors like 0x800F0950 , you will need an offline installation method.
Method 2: Create a True Offline Installer Using Windows ISO (Recommended) This public link is valid for 7 days
By using the , you take control of your system. You can update offline PCs, provision new machines twice as fast, and finally run that vintage tax software from 2014.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Install .NET Framework 3.5 on Windows 11 - Microsoft Learn