To get your system running, you will likely need the following components in order: Windows Installer 3.1 (v2) Redistributable

Example correct SHA-1 for dotnetfx35.exe (full offline): B57F6F1B7BA82B83ADE17B1B51C11C23D43BBEF7

If you are trying to run an application that requires ".NET 3.1," you should install the following components in order:

There is no official . This is a common point of confusion because Microsoft released Windows Installer 3.1 (a prerequisite for many installers) and, much later, .NET Core 3.1 .

It includes updates for .NET Framework 2.0, 3.0, and 3.5, providing a complete environment for apps requiring these versions. Offline Access:

To clarify, Microsoft never released a . This version number is often confused with Windows Installer 3.1 , which is a prerequisite for many .NET installations, or .NET Core 3.1 , which is a modern cross-platform runtime that does not support Windows XP.