Downloads: backblaze API error

Repro:

• Attempt to download this file:
  

  https://invisioncommunity.com/files/file/7185-developer-tools/
  

• When clicking "download this file", I'm getting this error:

  {
    "code": "unauthorized",
    "message": "b2ContentDisposition is prohibited for unauthenticated requests",
    "status": 401
  }

This may be a temporary issue with the backblaze service, but figured it should be reported in case its not.