I have a hidden artifact in the ".teamcity" directory.
When using the "guest" user, its not possible to download this artifact.
When using authentication in the URL, the artifact is downloadable.
Here is the sample URL:
What permission does the guest user require in order to download hidden artifacts?
A user requires "View build runtime parameters and data" permission.
This is because .teamcity directory may contain sensitive information about build (including parameters value)