Previous versions of deobf are missing for baubles. I was trying to test something in thaumcraft for 1.8, but it attempted to download baubles from a dropbox which gives a 404.

which one was it trying to download?

I don't need it anymore, the issue was resolved another way, but for reference it was the baubles required for Thaumcraft-deobf-1.8-5.0.3 . I've somehow messed up my dev workspace so I'm unable to tell you the exact version as I can't get minecraft to launch.

Downloading file https://dl.dropboxusercontent.com/u/47135879/Baubles-deobf-1.8-1.1.1.0.jar
I should probably have checked closed issues, someone else had the same problem 2 weeks ago.