We took our old window out and put a new one in ourselves. The hardest part was taking out the old window and removing the old sealant - you definitely need two pairs of hands. My OH is a engineer, so had worked out a way to support most of the weight of the window whilst removing the screws, but there were about thirty screws to remove and I had to stand there holding up some of the weight for quite a while. Side windows on a flat surface can just be 'slid' along the hinge making them much easier to remove, but ours (and probably yours) is set in a recess meaning you have to remove the hinge from the van.
Putting it back in was much easier. We used new sealing tape, and new stainless screws, and it went in perfectly first time. Then handles back on, and stays back in place, and a new seal across the top of the aluminium hinge (additional to the sealing tape) and it all looks as good as new.
If your Sprite is new, though, it should still be covered by warranty.
The company who made our new window told us that a lot of the problems occur when vans are stored in direct sunlight on to the front window. Apparently the sun causes the plastic to expand, and when it contracts on a very cold night it can lead to stresses in the plastic which build up over time to cause cracks - which can then occur suddenly whilst towing. Ours appeared after a very very hot holiday in France last year, although it is stored in direct sunlight too. We've now covered our window with a foil protector, and bought a cover from ebay to cover the van whilst it's in storage. This also means that it's amazingly clean when you unwrap it after the winter!
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