Arduino Number

I am confused about the "Arduino " edition number between# 13 or #15 ....In the Ardupilot setup instructions it links youto the Arduino15 to download and use but no reference to13....Yet here some say we have to use 13 for certain editions of“ Ardupilot “Help requested please ....Thank you De VO1ET Jerry .....
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  • 3D Robotics
    For the current versions of ArduPilot 2.1 and the beta of 2.2 you need the latest version of Arduino (15).

    For earlier version of ArduPilot (no longer supported), you should use Arduino 13. There was a change in the way they handled binary operations after 13.
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