AgOpenGPS v5.1.1
Version 5 of AgOpenGPS. Download and right click on AgOpenGPS_v51.zip and in Properties "Unblock" it. Unzip the file and run AgOpenGPS.exe
Download and Unblock the Support.zip as well which contains all the firmware, boards etc.
Run XLoader.exe to load the hex ino files to the Arduino Nano or the Arduino IDE.
Using vehicles from the Beta release is not recommended.
5.1.1 fix to load old Beta Vehicles, Delete field in OpenField Picker
20.April.2021 Support has schematics added to it.