Install the Ollama runtime
Download and install Ollama for your platform from the official download page: https://ollama.com/download. Native spark2_5 support requires Ollama v0.34.1 or later, so install a build at or above that version. On macOS and Windows the installer places the ollama binary on your PATH; on Linux follow the installer instructions on that download page. After installing, open a fresh terminal so the ollama command is available.