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First you have to setup Galacticraft, I recommend that you read this before starting 4Space development: http://wiki.micdoodle8.com/wiki/GC3_API#Full_Galacticraft_Sources set it up with full Galacticraft sources if you get Galacticraft error reference that wiki page. Then you can download 4Spaces sources from this github and put the src folder into your Forge workspace. Once this is done launch your IDE and you should have a fully working 4Space / Galacticraft development environment!