I've released version 1.0.1 of Cutupsampler. I'm abandoning the 1.1 release, which was a fun experiment, but which no longer works. It was interesting to experiment with the Echco Nest API for determining audio event onset boundaries, but it would be more efficient not to use a web API for that purpose, and it appears anyway that they have decommissioned their API.
Version 1.0.1 has also been compiled to work with macOS Mojave (10.14). Older binaries won't work with it.