How To Fix A Zipper?

I've googled but they all want me to sew... Surely there must be another way.

My issue - the 'jacket'  is only attached to one track. It has a little 'stopper' at the bottom so I can't just jerk the jacket down and hook it onto the other side of the track. Is it okay to remove that part? How would I get it back on? Can I fix it without sewing a darn thing?