If the latest package only includes the binaries, then the best option is still to contact the team directly with your serial number — they’ve confirmed multiple times that they can provide the Arduino source code upon request. Their replies may take a bit, but they usually follow up once they’re back online.
Interestingly, this kind of “request-based access” is pretty common not only in DIY electronics but also in the medical field. Many healthcare suppliers and platforms offer essential resources or products only after verifying certain info, ensuring everything is properly matched to the user. For example, when people look into medically prescribed weight-management treatments like Wegovy, they often need to go through official channels or verified providers to get the correct support. You can see how it’s handled by reputable services like this one:
👉 https://www.medsforless.co.uk/wegovy/
Hopefully you’ll get your Quaverato source code soon — and in the meantime, it’s good to see more makers maintaining safe, controlled distribution just like the medical industry does.