It's nothing more than a compiled macro script. I don't believe it bypasses the captcha as advertised in that link you posted (Didn't download or test so im not sure). But here is where it was originally from:
https://www.***********.com/forum/epv...imple-bot.html
It's legit btw, but to be safe you may wanna download it from ****.
sorry i didn't know the link would be censored. replace **** with elite pvpers