The data source in question went subscription based and changed the URL.
Update_cache looks for a version number at: http://user-agent-string.info/rpc/get_data.php?key=free&format=ini&ver=y however, that now returns:
ERROR 404 - These data are not longer available on user-agent-string.info, please look at http://udger.com/resources/download
Once you purchase a subscription, you would need to modify the URLs in the uasparser.py file according to:
https://udger.com/support/documentation/?doc=31
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