Fix up Downloader help / error message and ensure we only query builds with the CodexOutputs tag which is added by the VSTS task.
Fix up Downloader help / error message and ensure we only query builds with the CodexOutputs tag which is added by the VSTS task.

Ref12/Codex,Ref12/Codex,Ref12/Codex,Ref12/Codex,Ref12/Codex,Ref12/Codex