Needs updating to 64-bit – HP 15C Calculator Review

This app needs to be updated to 64-bit operation on the iPhone, or else it will fail to operate in future. Also, why did I have to pay $15 for V2, when I bought V1 for $30 many years ago?! These comments also apply to the HP 12C calculator app.
Review by DJenner8 on HP 15C Calculator.