when exists

    checkpoint_alisases.clear()

    cmd_ckpt = shared.cmd_opts.ckpt

    if shared.cmd_opts.no_download_sd_model or cmd_ckpt != shared.sd_model_file:

    if shared.cmd_opts.no_download_sd_model or cmd_ckpt != shared.sd_model_file or os.path.exists(cmd_ckpt):

        model_url = None

    else:

        model_url = "https://huggingface.co/runwayml/stable-diffusion-v1-5/resolve/main/v1-5-pruned-emaonly.safetensors"