I'm afraid I cannot put it more accurate or more simple terms than the utilities readme file, and running OOTP History is just not easy enough to do without following the readme accurately. In fact, I have run OOTP History dozens of times but still follow the readme step by step each time, it's very well written actually

. You can find the readme file in the install file and patch file of the OOTP History utility you currently have, or check it out
here. Good luck!