if you want install the free-threaded mode of python, you can select the version ends with t, like v3.14.0a4t. You can configure the mirror by VFOX_PYTHON_MIRROR ...
Aider works best with Claude 3.7 Sonnet, DeepSeek R1 & Chat V3, OpenAI o1, o3-mini & GPT-4o, but can connect to almost any LLM, including local models.