For MacOS users.
Download Ollama for macOS. https://www.ollama.com/download
Run the application and accept install steps.
Open MacOS Terminal
app found in the Applications Utilities folder.
You can now enter the commands described in the README Run the model section.
ollama run deepseek-r1:1.5b
You can also run other LLM models supported by Ollama such as this smaller version of Llama 3.2.
ollama run llama3.2:1b