captchas are getting harder to read so that they do not get solved by automated methods. the only way to bypass captcha is to get it solved by humans. find out at jdownloadercaptchabypass.blogspot.com
Captcha is also pointless because it can be cracked, the "valid" code can just be found with a bot and run several times, so it's truly a huge waste of everyone's time. There's even a video on how to do it (v=e46A-PUpDvk, for instance :P)