For the rear 1/4 windows on an estate
remove the rear screws holding the hinge in place
remove inner boot trim (rear)
Look up to the lower corner of the window from inside the 1/4 (might need a torch) You will see a nut/bolt (probably very very rusty) soak in loads of 3 in 1 and remove.
Window should lift out from the bottom (it’s a locating peg at the top)