If they are snug in the channels you may want to consider tweaking the channels open a little if you can do it without damaging the finish. Maybe a stiff putty knife would be enough to pry it open a little.
You will need to be able to slide the panels into the channels from the latch side. Use a broom handle placed between panels and door frame to bow the panel out in the middle and work it over the window crank (handle removed of course) as you slide toward the hinge side.
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