Download .NET Framework 4.5 Offline Installer The offline installer is a redistributable package that allows you to install the framework on machines without an active internet connection.

Elias sighed, his breath visible in the freezing air. Outside, the world was a wasteland of silicon and sand, but in here, he was fighting a war against obsolete code. He reached into his satchel and pulled out a weathered, silver thumb drive—a "relic" passed down through three generations of scavengers. It contained the dotnetfx45-full-x86-x64.exe offline installer, a file more valuable than gold in a world without a functional internet.

, but if you specifically need 4.5:

Perfect for "air-gapped" computers or slow connections.