Need to dismatle to move and can't
There are a lot of different treadmills and stairways that require specific solutions, but there are some general solutions.
You say you can't disassemble it, so try forearm forklifts, they can make a 2 person lift very manageable. Also if you have a large piece of cardboard (and once again, 2 strong people) the cardboard can be used to both provide a surface that will slide up the stairs and distribute the weight over a larger area, so you can actually put it on it's side without causing damage.
I've used this technique and it works with a little caution and muscle.
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