The is a historically significant but obsolete redistributable. While its standalone nature is useful for legacy systems, any new or restored deployment should use .NET Framework 4.8 offline installer for security, performance, and OS compatibility. If you must use 4.0, always verify digital signature, run silent installs via /q , and never expose the system to untrusted networks due to unpatched CVEs.
The web installer only includes a small bootstrap file that must download the actual components during installation. The offline installer contains all necessary files in one package (~48.1 MB), allowing for installation on machines without internet access. always verify digital signature