I get the following error when trying to load:
molten_plastic/prototypes/compat-updates.lua:13: module Krastorio2-spaced-out.prototypes.libraries.matter not found; no such file Krastorio2-spaced-out/prototypes/libraries/matter.lua
stack traceback:
[C]: in function 'require'
molten_plastic/prototypes/compat-updates.lua:13: in main chunk
[C]: in function 'require'
molten_plastic/data-updates.lua:3: in main chunk

Hey there,

after clarifying with Emily that the K2 dependency is here to stay, I've updated the compat patch, this is now fixed in 1.0.42.

thanks for the report!