in windows terminal, run python model_downloader.py script error

## Describe the bug

in windows terminal, run python model_downloader.py script error

## To Reproduce

Steps to reproduce the behavior:
1. use backend env in installed directory
2. run model_downloader.py script
3. See error
```
.\python.exe ..\service\model_downloader.py
TypeError: HFPlaygroundDownloader.download() missing 1 required positional argument: 'backend'
```
4. when fix backend error, then encounter
```
TypeError: test_download_progress() takes 3 positional arguments but 4 were given
```

## Expected behavior

A clear and concise description of what you expected to happen.

## Screenshots