Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
The 15C app has already been updated. However, there was one very early version of it that can't be updated because of some technical changes on Apple's side. That is the one you probably have.
However, we can get you onto the second version which IS updated and avilaible already. Please send a message to calculators at hp.com with your information. Thanks!
Just send an email as directed and let them know you have the old 15C version. They may ask for additional information.
We'd like to update the old application, but cannot due to something technical on apple's side.
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