I want to perform some experiments on tiltrotor in Realflight, but the model of given Griffin VTOL was made a few years ago and has parameter list made for ArduPlane 4.1.0. WHen trying to build 4.1.0 wign Cygwin I run into a problem that Cygwin does not support that old version. Does anyone have a way to build an older version of ardupilot or ArduPlane 4.1.0 .elf file?
You could try WSL workflow. If config version is correctly set in the param file the migration to current version should work, though tuning again is recommend as there were improvements to AUTOTUNE and PIDs between 4.1 and 4.6.