how to remove CONCEALED DOOR LATCH

A quick learner says:
October 10, 2017
Hello, I have a concealed door knob and latch that has a piece of the door latch broken (see images). I don't think there is another door latch i can use to replace current?? So i think i am stuck with #10-401 replacement kit.

Please advise. ALSO, if i am stuck with kit# 10-401, how do i get the existing door latch out?
Concealed door latch
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Dave Sr. from SWISCO responded:
October 16, 2017
In some cases, bathroom stall doors are welded together and cannot be taken apart. If you can take your door apart to access the internal latch, you might be able to use the 10-563. If not, you will have to try and take your existing latch apart in pieces to remove it. It will not be an easy process, so you may want the help of a professional.
Concealed Door Latch
Concealed Door Latch
10-563
$6.20
Inswing Door Latch Repair Kit, Round Edge
Inswing Door Latch Repair Kit, Round Edge
10-401
$27.92
How to use the 10-401 inswing partition latch repair kit
How to use the 10-401 inswing partition latch repair kit
GUIDE
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