It's been a while...but take a 17mm (I think) box end wrench and slip it onto the back of the circular prongs that hold the hinge covers in place, then push gently on it. That should collapse all 4 prongs at the same time and make them fit through the hole in the frame.
I think the hinge covers have to come off no matter how you do this, the others I really don't remember clearly.
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