@mmcm @256
Seems a good fork exists:
https://github.com/hakuna-m/wubiuefi/
and general chat about it
https://askubuntu.com/questions/654990/can-i-install-wubi-on-windows-10
(especially liked the 'it's not supported' being repeated but people saying it works fine (yes pinch of salt there also but a lot seems like there is a difference between 'we don't support / encourage it' and "it's more possible than not, do a backup first".)
@freeschool @256 I don't think you can still get it, or rather, I don't think the last release will still work as intended, given that it is 13 years old. They seem to have stopped developing it, but like I said, I found it very clever and useful at the time since it made installing Ubuntu much less scary. I have no idea if something similar exists today though. *sigh*