Given our current in-between releases, there’s been a lot of questions regarding nightlies and mods and what goes where and etc, so hopefully this will help you out: https://www.ufopaedia.org/index.php?title=Installation_FAQ_(OpenXcom)
It’s intentionally dumbed down and not meant to be exhaustive documentation covering every single possible setup and platform (that’s what the rest of the wiki is for).
Many thanks for the summery!
Many thanks for the summery
There is an Arch Linux package which grab the data from Steam and convert it to Arch package:
The only trick is that there isn’t Linux UFO/TFTD version so you need to introduce to steam as a windows platform.