Using Proxyscan.io and asd it builds a list of proxies able to be imported and ready to use for JDownloader
You need to prepare your virtual environment first:
$ virtualenv --python=python3 venv
$ source venv/bin/activate
(venv) $ pip install -r requirements.txt
Then just execute it:
$ python3 proxy-scrapper.py
your proxylist will be a file named 'proxylist.jdproxies' (a json file) that jdownloader understands. As the list is dynamic, when you have burned all your proxies just replace the list with a new generated one. Happy Downloading!