seems like variables HF_DATASETS_OFFLINE, TRANSFORMERS_OFFLINE and DIFFUSERS_OFFLINE=1 for some strange reason brokes loading of exact this one webui lol, i removed them and replaced with another variable that makes webui works offline, so you can redownload it. let me know if it really works.
You also can make your portable work without downloading these 6gb twice, just open miniconda3/scripts/activate.bat in console and type
conda env config vars set HF_DATASETS_OFFLINE=0 TRANSFORMERS_OFFLINE=0 DIFFUSERS_OFFLINE=0 GRADIO_ANALYTICS_ENABLED=0