D:\Program Files\Microsoft Visual Studio 14.0>rustup update info: syncing channel updates for 'stable-x86_64-pc-windows-msvc' info: downloading component 'rustc' 38.1 MiB / 38.1 MiB (100 %) 3.6 MiB...

rustup self update fails on windows, can't remove its binary · Issue #1188 · rust-lang/rustup