Kali nethunter rootless download img file from termux CORRUPT

So if followed the guide to install the the rootless nethunter kali, with kex, appropriate keyboard, termux etc. No when I get to the kali screen in termux and start the download which I have 3 times when it's finished I get a "file download image is corrupt, re try download or manually install" obviously as of now I see that I need to manually download it however I can't find a reliable source or guide on how to do that...

Help much appreciated.