No, they are not identical. While .NET Framework 3.5.1 is based on .NET Framework 3.5 SP1, it includes additional updates and modifications specific to Windows 7. This is why the recommended method for Windows 7 is to use the built-in Windows Features option rather than downloading the standalone installer for .NET Framework 3.5 SP1.
These errors mean Windows cannot find the source files to complete the installation.
This guide will help you get it safely. You will learn how to check for it, download it, and fix common setup issues. Why You Need .NET Framework 3.5 microsoft net framework 3.5 1 windows 7 64 bit download
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This is a more drastic tool to use only if the Repair Tool fails. No, they are not identical
Because it includes these older iterations, it acts as a universal bridge for software built between 2005 and 2010. System Requirements for Windows 7 64-Bit
A smaller file that downloads necessary components during installation. System Requirements Operating System: Windows 7 (64-bit recommended). These errors mean Windows cannot find the source
Ensure you select the Redistributable Package . Even though the installer is labeled "3.5," it includes the 3.5.1 updates for 64-bit architectures (x64). Common Installation Issues & Fixes
If the built-in feature is corrupted or you need an offline installer, use these official Microsoft Download Center Full Offline Package (.NET 3.5 SP1)