Elan is a lightweight utility designed to simplify the management of Lean theorem prover installations on Windows. This free tool automatically configures your environment to include the necessary Lean and lake binaries in your system PATH. It streamlines the process by automatically selecting and downloading the appropriate Lean version based on the specifications in your project's lean-toolchain file. This ensures that you are always working with the correct version of Lean for your projects.

In addition to its automatic features, Elan also provides users with manual control over their Lean installations. Users can install, select, run, and uninstall different Lean versions as needed through the command-line interface of the elan executable. This flexibility makes Elan an essential tool for developers and researchers working with the Lean theorem prover, enhancing productivity and managing dependencies efficiently.