MacOS: "Missing key 'artifact' on libraries[*].downloads" when downloading 1.7.2

The version manifest was corrupt.
Error details: Missing key 'artifact' on libraries[*].downloads (should be object, required as there's no classifier)

I get this error when trying to load 1.7.2, all other versions work however. It only started happening today after the launcher was updated, I don't think anything else has changed.

The actual version of the launcher says 2.0.1004, but it wasn't in the dropdown.