It looks like carlashley archived the loopdown repo last week and is no longer maintaining it. If you use the forks link (https://github.com/carlashley/loopdown/forks) on that repo you'll see a couple of forks that were updated in the past 6-7 months that might be wort a try, or at least have maintainers that might be responsive to a request for an update.
No very little about python needs a lot of updating from what I can work out. Bit stumped on what to try next. I installed the latest version of python but couldnt get it working.
Ask your Apple contacts about the Loops script: Loops is a light weight solution for distributing and installing GarageBand or Logic Pro loops and instruments.
