I just reloaded this to my rambo a couple weekends ago. Downloaded from the repo (which seems to have some updates), unzipped, found the grbl folder (in my documents, not C for some reason) replaced it with the new one, changed 3 linear axes to 5 (so I can work in inches and not have errors with ijk moves), save, upload, done.
I did the rest of the grbl setup via console for size and speeds. None of the steppers needed to be reversed.
Good luck!
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