The is a comprehensive package that allows you to install the runtime environment on computers without an active internet connection. It is a free, "in-place" update that replaces or upgrades previous versions (4.0 through 4.7.2) while maintaining compatibility. Core Specifications

: Freeware; available for personal and commercial use at no cost.

: 4.8 (often referred to by KB numbers like KB4486153 or KB4486129 depending on the OS).

: Offline (Standalone), which includes all necessary components in one larger file, unlike the web installer that downloads data during the process.

You should only download this framework from official Microsoft sources to ensure file integrity and security. Microsoft .NET Framework 4.8 offline installer for Windows