If you still have RosettaCommons GitHub access, the weekly releases are available under the weekly_releases branch namespace. For example to get the 2013 week 33 weekly release, you’d simply do something like “git fetch origin; git checkout -t origin/weekly_releases/2013-wk33”.
If you don’t have access to the RosettaCommons git repository anymore, I do not believe we have any setup to allow for git access to the weekly releases. (As I understand things, Git & GitHub makes it hard to isolate access to just the weekly release branches.) Though as a RosettaCommons alumn, you may be able to negotiate read-only git access with your former PI, even if you might no longer have push privileges – though don’t quote me on that.