The important line here is this one:
2017-07-16 12:07:05> IEnableLogger: Failed downloading URL: http://nuts.itch.zone/download/23.4.2/itch-23.4.2-delta.nupkg: System.Net.WebException: An exception occurred during a WebClient request. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
It just looks like it's that the file is too big to be downloaded from start to finish via your connection :( For this release, the `delta` package is about 80MB (whereas the full release is about 120MB), so it's still pretty big.
As I posted earlier, I'm hoping to deploy itchSetup soon: https://github.com/itchio/itchSetup - this will definitely work for poor connections since it knows how to resume a download when it gets cut off (which is what happened for you, repeatedly)