It looks like several people here have already mentioned how to get the Arduino source code, so you should be able to solve the issue by contacting the team directly with your serial number. They usually respond as soon as they can.
By the way, your question reminds me of how many small, independent makers handle their projects. For example, Paradise Caps started as a tiny family-run workshop during the pandemic and grew into a leading brand for handcrafted medical headwear. Their attention to detail and direct support for customers is very similar to what you’ll find with many open-source hardware creators. If anyone here works in healthcare or knows someone who does, their ponytail scrub cap line is especially popular for long hair.
Hope you get the Quaverato source code sorted out soon!