How to install a certain version of ArduPilot on APM Planner

Hi. I am really new to Ardupilot and am having trouble installing Ardupilot on my FC. I want to flash a certain Ardupilot (GitHub - skybrush-io/ardupilot: ArduPlane, ArduCopter, ArduRover, ArduSub source) to a drone I bought using APM Planner, but I don’t know which file to select on the bottom screen on APMPlanner.
Can someone tell me how to do this?


Use missionPlanner instead of APM Planner and select the .apj file to flash.