I have a Cube Orange running ArduPlane 4.1.0dev in particular commit: 211cd52 (https://github.com/ArduPilot/ardupilot/commit/211cd5255da771db78bb22578c9daede40d227f2).
Here is the same build from the autobuild server history - https://autotest.ardupilot.org/history/2020-11-30-11:11/
I know that the latest build can be fetched here - https://firmware.ardupilot.org/Plane/latest/CubeOrange/
Mission Planner shows the latest as per the link above as well.
Github doesnt seem to have them as a release either https://github.com/ArduPilot/ardupilot/releases?after=AP_Periph-stable
But is there anyway to get this specific build from somewhere other than trying to scrape it off the Cube itself which looked complex…