I have a very similar setup to yours and use (free) version Z.A.3.72--
I agree I also didnt like the supposedly new improved interface (fat toolbar & ugly add)
Updating is allways a concern "if it aint broke dont fix it" however in Z.A's version release historys most of them are to improve security (whos they dont say lol) and I guess I didnt install Z.A for the pretty interface so I upgrade from time to time.
I think Z.A. has a forum you might find something there