So 2.1 basically killed this mod and most like it as far as I can tell, as they relied on references to base folder (basically going from base out, and then into space age, leveraging the fact the two folders were next to each other). Second to enabling all of space age and manually undoing every change or addition it makes short of music, unsure if there's a work around, and I doubt devs will add an official "space-age-prototypes" or library mod, which sucks as this "hack" still required you to own Space Age, as it checks the Space Age folder, but is understandable from a security concern to have this patched.
What you can do for now, go to your mods folder (if Windows, usually C:\Users\USERNAME\AppData\Roaming\Factorio\mods\) and find (and unzip if zipped) this mod...
- Update the
info.json as usual: "factorio_version": "2.0", --> "factorio_version": "2.1", (skip if Wiwiweb changes this)
- In
data-final-fixes.lua, Line 2: Space_age_path = "__base__/../space-age" --> Space_age_path = "__space-age-music-without-space-age__/space-age"
- [OPTIONAL] Change Line 1
-- Devs please don't patch 🙏 to -- Devs please don't patch 🙏 RIP it got patched lmao XD
- In this mod folder, add the folders
space-age/sound/ambient/ and in that /ambient/ folder copy-paste all the songs from Factorio/data/space-age/sound/ambient/. You're copying the full planet folders over (/aquilo/, /fulgora/, /gleba/, etc.). None of the other folders need to have any surrounding data, just that folder structure.
- On Windows, the Factorio base folder and Space Age content will be somewhere like
C:/Program Files (x86)/Steam/steamapps/common/Factorio/data/space-age/sound/ambient.
- You could do with not as many folder structures and change all the references but for those who don't have a program to mass-replace lines quickly that'd be very tedious and I wanted to make this as simple as possible.
Have fun mates, and thank you Petr Wajsar and your team of amazing instrumentalists for this beautiful music.