It assumes the multiversion downloads file contains "evg_urls_info" with download links.

See https://github.com/mongodb/mongo/blob/master/buildscripts/resmokelib/hang_analyzer/extractor.py#L597

Instead, if "evg_urls_info" is empty it should fallback to 

binaries = version_downloads["release_urls_info"]["urls"]["binary"]

debug_symbols = version_downloads["release_urls_info"]["urls"]["debug_symbols"]

It's also worth re-visiting whether this logic has to be re-implemented here, or if it should just use db-contrib-tool directly.