Visual C++ Runtime 2015 ^new^ [ 2025-2026 ]
In simpler terms: Many Windows programs are written in the C++ programming language. Developers use "libraries" (pre-written code) to make their software work. Instead of including these massive libraries inside every single program you download, Microsoft provides them as a shared component on your computer. If a program requires the 2015 version of these libraries and you don't have it, the program will crash or fail to start.
This is the most confusing part for users. Windows has two types of architecture, and you often need versions of the runtime installed. visual c++ runtime 2015