Most likely an oversight, however i cannot load this mod at all due to k2 and k2so being incompatible together, yet this mod is dependent on k2 and does not load without it.

K2 is a required dependency of K2SO

it's not? unless that's for 2.1, which i have not played yet, but for 2.0 at least its impossible to load k2 and k2so simultaneously as k2so marks k2 as incompatible

Ah, it does look like that was a change made for 2.1
I may upload a fixed version later but I don't plan to support 2.0 once 2.1 is out of experimental.

I just pushed a quick fix that removed the hard dependency on K2 just to allow launching with K2SO.
This is just a dirty fix and will cause a startup crash if attempted to launch without either of those mods.

lol i wish i could play 2.1, however a lot of mods i like still have not updated to 2.1 at all so i am keeping on 2.0 until prob much later

K2SO depends on K2 right now at 2.1, just in case.