Originally Posted by NUTS RuS
Working from the inside fold the rubber lip up and out. Work your way round and after about 1/2 is done you will be able to lift it out.
For a quick fix for now you could smear the cracks with silicone sealant that should stop it leaking
Sod that
Takes an age
You just lie on the back seat and push the window out with your feet
(dont forget to have your glamorous assistant ready to catch it
)