They contain all components required for installation, making them larger in size but self-sufficient, unlike the small "web installer". In-Place Update:
Unlike the "Web Installer," which downloads files during the setup process, the (also called a standalone redistributable) contains all necessary components in a single file. net framework 4.3 offline installer
were released as "in-place" updates, meaning they replaced 4.0 rather than sitting side-by-side. net framework 4.3 offline installer
Versions 4.0 through 4.8 are in-place updates, meaning you cannot have two different 4.x versions running simultaneously. Best Version for Use: As of 2026, .NET Framework 4.8 net framework 4.3 offline installer
Now that you have the correct file (likely ndp481-web.exe or the full offline bootstrapper), here is the step-by-step guide to installation.