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I want to know if you can download some software that will allow you to edit Halo PC for free (because i'm just a cheapskate).
HALO CE and HEK are both free, unsupported softwares released by Gearbox. You can get all the stuff from the links provided at www.cortana.org. Hope this helps.-Telefragged
1 more thing. Can you use the HEK for the Halo trial
No, the trial only supports Blood Gulch.