It replaces missing or corrupted .dll files that cause crashes.

As long as you download from trusted community repositories, it is perfectly safe. These packages aren't "hacks"; they simply bundle the official Microsoft installers into a convenient script to save you from clicking "Next" fifty times. Pro Tip for Gamers

If you’ve ever tried to launch a PC game or a professional software suite only to be met with an error message like "The program can't start because MSVCP140.dll is missing," you’ve encountered a runtime issue.

In simple terms, these are "translation layers" that allow apps built using Microsoft’s Visual Studio to run on your computer. Developers use shared code libraries (DLLs) so they don’t have to rewrite common functions from scratch.

Many AIO tools remove old, buggy versions before installing the latest, most secure updates. Common Errors Fixed by All-in-One Runtimes

If you are setting up a fresh installation of Windows for gaming, the Visual C++ AIO should be one of the first things you install, alongside your GPU drivers and DirectX. This prevents 99% of "first-launch" crashes in Steam, Epic Games, and GOG libraries.