XZise added a comment.
AFAIK you just need to use http://tools.wmflabs.org/pywikibot/core_old.zip although it currently returns a 404 so maybe the URL is wrong or it didn't create a old build yet.
@Ladsgroup I don't know if the link will appear as soon as it is available but if not could you please add one in https://tools.wmflabs.org/pywikibot/ ?
TASK DETAIL https://phabricator.wikimedia.org/T98592
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To: Ladsgroup, XZise Cc: XZise, Ladsgroup, Wesalius, Aklapper, pywikipedia-bugs