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