They are stored on their server (that is down at the moment), there’s no version control for them so there can’t be an actual repo. Also, it’s possible that some of them won’t build as is due to C++ API changes over years (it’s usually backwards compatible, but likely not in 100% cases).
It wouldn’t be too hard to download all patch binaries once the library is back as their URLs can be extracted from a single JSON file IIRC. Flashing patches requires sending a few extra Sysex commands first to specify that it should be flashed in a specific slot, etc. I actually considered making an utility to do exactly that (sync patch binaries from OWL server to local machine and allow flashing them to a connected device). Not sure if this outage will be enough to motivate me to finish this
Btw, I’ve send messages to Martin & Manu about this 3 days ago - no response yet, but I guess someone will end up restoring server next week.