Sampler's Friend has been installed to your Applications folder.

The first time you use stem separation, it downloads about 2 GB of additional files (PyTorch and the Demucs model). This only happens once, but can take a while depending on your connection — subsequent runs are fast.

If macOS warns that the app is from an unidentified developer when you open it, go to System Settings > Privacy & Security, click "Open Anyway" next to the Sampler's Friend message, then launch it again.
