Inkscape 1.4.x cannot be downloaded from inkscape.org
Summary:
The Windows version of 1.4 has been unavailable since 1.3's release. It should be possible to download it from here, which takes you to here, but you get a 404 error.
I am aware it can be gotten in Gitlab through other means, but that is much less convenient. I suspect that the Windows version is mostly untested at this point.