Locate in the list.
You can obtain the .NET Framework 3.5 SP1 through several secure methods: net-framework-3-5-sp1-download-get-into-pc
: Recommended for systems without internet access. You can find the 231 MB standalone installer on the Microsoft Download Center . How to Install on Modern Windows (10/11) Locate in the list
On newer versions of Windows, you typically do not need to download a separate file. The framework is already included as an optional feature: net-framework-3-5-sp1-download-get-into-pc