This is not a question of upgrade his DLE Version, it include much more things.
PM me how much are you willing to pay for this service then i'll see if take the job or not.

I owned some DLE sites and worked on other people sites before so I have some quite experience.. the whole process may take up to 12 hours of optimization/testing/optimization/testing..
So you see it takes time and is boring

ps. I accept PayPal only.