Most likely there is somerthing that it is catching on where the window is pushing down on the sleeve.
What you can do is get a piece of thin cardboard and slip it in between the sleeve and the unit and then try to pull it out. The cardboard will have marks put into it where ever the unit is binding. Once you know where it is binding you can use a thin piece of metal to act as a shoe horn in reverse and allow you to pull it free.
If you have acces to a piece of sheet metal you can forego the cardboard and just insert it where you think it is binding.
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Best regards; The Home Smithy
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Well in order for you to provide feedback you will have to accept my answer first. The system is kinda funny about those being in the right order you know.
But Sunday will be fine for both.
BTW I'll be here Sunday too. Just in case you have any trouble with it.