From your pictures, it looks like some of the diagonal cross-wires (stiffeners) are broken. You should probably fix those before trying to set it up. They are critical to the strength of the tower.
The old Aermotor at my Dad's place had a couple that were broken for a long time; a few years back a storm came through and straight line winds caused one of the 'legs' to buckle (gotta fix it before it falls down).
I guess I should give it credit for toughness, though. As you might be able to see in the picture below, the old barn didn't fare as well in that same wind.

-RatOmeter