Off-line Windows 10 Installation

How do I install Rust on a Windows 10 computer which is off-line?

You can download the standalone installers:

There are 5 items including the word "windows". Which one should I use?

Probably x86_64-pc-windows-msvc if you're not sure.

You may also need to manually install Visual Studio for the linker and system libraries:
https://rust-lang.github.io/rustup/installation/windows-msvc.html