Faster for multiple deployments since you only download the file once.

Prevents installation failures caused by interrupted downloads during the setup process. Most Relevant .NET Framework Versions

Legacy version for older systems like Windows XP or Server 2003. Download 4.0 How to Install Using an Offline Installer

If you're looking for the , it's important to clarify that Microsoft never officially released a version specifically titled ".NET Framework 4.3" .