An update to biblatex and/or biber altered the bibliography output of biblatex-chicago and is creating a problem with a project's required bibliography format (which used to work). Still trying to find a workaround or fix, but meanwhile need to get the project out to production asap.
Can someone walk me through where to find old versions and how to revert to older package versions with TexLive? The solutions in "Is there a way to revert manually to earlier versions of a package?" and the other questions linked in it no longer work, since the repositories referenced either no longer exist or do not contain the packages I need.