Select the download labeled dotnetfx35.exe (this works for both 32-bit and 64-bit Windows).
To successfully install or enable .NET Framework 3.5 on a 32-bit (x86) Windows 7 system, the following minimum hardware specifications are recommended: .net framework 3.5 windows 7 32 bit download
The SP1 update (July 2024 revision) includes enhanced application startup times and better code generation. Review: Pros & Cons Select the download labeled dotnetfx35