going through the manual option I noticed a 6 or 7 digit code in the URL, entered that and it worked. Hopefully that works for you too
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In the downloader, when the "waiting for authentication" step takes too much time, a "manual authentication" button will show up.
Clicking on this button will open your browser again on the url https://portal.eu.andrealphusgames.com/token?manual=True
Going through the authentication process will lead you to a page showing the token to paste in the downloader