I can put this in Github if needed. But I'm reluctant to automatically go to there if there is a solution or a ticket isn't really needed.
I'm using MacOS and just tried
error: could not download file from 'https://static.rust-lang.org/rustup/archive/1.9.0/x86_64-apple-darwin/rustup-init' to '/Users/username/.cargo/bin/rustup-init'
info: caused by: error during download
info: caused by:  Transferred a partial file (transfer closed with 482184 bytes remaining to read)
rustc --version and got back:
rustc 1.23.0 (766bd11c8 2018-01-01)
So I'm not sure if everything is all good or what I should do if anything to fix the error?