Looks like they changed the path of avrdude.conf. I’ve just updated the github to work on the latest version, let me know how that works for you now: GitHub - samyk/easel-driver: Easel driver for Linux, Mac, Windows, ARM, Raspberry Pi, Intel, FTDI, CH340, CH341, CP210x, FTDI clones, local, and remote access to GRBL-based CNC controllers