selene is written in Rust, and the recommended installation method is through the Cargo package manager.
To use Cargo, you must first install Rust. rustup.rs is a tool that makes this very easy.
Once you have Rust installed, use either command:
If you want the most stable version of selene
cargo install selene
(Note: Currently, the above method will give you an outdated selene, as the selene crate on Cargo is not yet maintained.)
If you want the most up to date version of selene
cargo install --git https://github.com/Kampfkarren/selene selene
selene is built with Roblox specific lints by default. If you don't want these, type
--no-default-features after whichever command you choose.