I assume you are talking about the interface. Adwords is SaaS, Software as a Service, and you get what they give you. I understand you may have liked the old interface (I did too) but it's not that bad once you get used to it. Besides, you got no choice.
No you cant get back your old version....because Adwords has come up with new interface which is replaced by the old one.....So you wont get back old version....i know the new interface is not so user friendly but use it for sometime you will have the habit of that...
The new interface is much better than the old one. Use it for a while and you'll forget about the old one.
I second the people saying that the new interface is actually a lot better than the old one was. I completely agree that it may seem a little bit off at first, but once you play around with it for a day or two and watch the training videos if needed, you'll get a hang of it and I'm pretty sure you'll become to love it.