How update dependencies manually?

I have the following message when I execute setup.sh:

Github build
Checking / downloading the latest archives
Checking dependencies (excluding Win32, Win64, Mac, Android)...
Updating dependencies:   0% (0/28611)...
Failed to download 'http://cdn.unrealengine.com/dependencies/3129012-bf28ea8994bb4040ae9adb152d6eb9ff/03e73d5ad686a19a077957aad4037310d6feb8c1': The remote server returned an error: (503) Service Unavailable. (WebException)
Result: 1

I think it is due to my corporate proxy…but I can download manually the archive (http://cdn.unrealengine.com/dependencies/312…)

How can I update dependencies manually?

thanks