It doesn't seem to work for me at all. Downloaded the most recent file, put the "Reduced Launch Cost 10% 4.2" folder into my MODS folder, and my ship is still using 25%. I'm honestly a bit lost here given the installation notes that come with the .zip file are heavily outdated.
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https://www.nexusmods.com/nomanssky/mods/3490
No Man's Sky\MODS\Reduced Launch Cost 0% 4.2
Other mods, with other features, are working.
Instructions for future here https://wiki.nexusmods.com/index.php/How_to_create_mod_installers