Unlike some people, we really struggled to erect this, particularly as it is so flimsy.  We took such care to try to follow the instructions, but some of the holes did not match up and the roof was particularly difficult to slot in.  We had to insert many more fixings to ensure that we were happy for it to last even one winter.
Finally, we built a wooden frame inside the shed and screwed it to the frame to be certain it would last.