While there is no official Checkra1n 0.12.2 application for Windows, you can use "patched" methods to run it on a Windows PC. These usually involve creating a bootable USB drive or using a custom environment like How to Use Checkra1n 0.12.2 on Windows
These tutorials demonstrate how to set up the patched versions and bootable environments on Windows: checkra1n 0.12.2 patched windows
The journey to get checkra1n working on Windows has been tumultuous. While there is no official Checkra1n 0
Since there is no native .exe for the standard version, Windows users must use a bootable USB method. Checkra1n - The Apple Wiki checkra1n 0.12.2 patched windows