If you're still interested in using checkra1n 0.12.4 beta on your Windows machine, I recommend:
Is Checkra1n 0.12.4 Beta Available for Windows? The checkra1n jailbreak is one of the most celebrated tools in the iOS modding community. Based on the unpatchable hardware exploit "checkm8," it offers a permanent jailbreak solution for millions of older iOS devices. If you are searching for you are likely looking for a way to jailbreak your iPhone or iPad directly from a PC running Microsoft Windows. checkra1n 0.12.4 beta windows
This was fixed in 0.12.4; ensure you are specifically using this version. Important Considerations If you're still interested in using checkra1n 0
To run checkra1n 0.12.4 beta on a Windows PC, you must use a (commonly called checkn1x or Ra1nUSB). checkra1n 0.12.4 beta windows