3.11 was WfW, and ran on top of DOS just like 3.1 did.

NT 3.51 used the NT kernel, and (mostly) looked like 3.1/3.11 on the surface. NT 4 used the NT kernel, and (mostly) looked like Win95.

Win 95/98/Me also ran on DOS, though it was more tightly integrated than it was in the 3.1 days.

Win 2k and everything after was based on NT.

I don’t have an alternative program to suggest, but there are some workarounds for using redshift.

First, in the config file, you can set the location provider to manual, then specify a lat/lon and it will use that location in its time calculations. I do this on my laptop, and it works well except for when I cross multiple timezones - things are obviously off a bit.

Second, with the caveat that I haven’t tried this, it looks like you can also manually set dawn/dusk times in the config, which sounds like what you’re after.

See man 1 redshift for more info.