It could be fireblight or apple scab. I’m not sure though. If you want serious help with saving your tree you should consult someone who is experienced with horticulture. They’ll be able to diagnose your problem and help you out more than any online forum.
That is a sure sign of Verticillium Wilt. Prune out the affected branches. Sometimes that will be enough, other times the tree will eventually succumb and need replacing. Go to site below for a full description of the disease:
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