If you are trying to find this specific version to play on a private or legacy server:
: Check the "Betas" tab in the Rust Steam properties to see if the developers have made a specific "Legacy" or "Staging" branch available for older hardware or testing [1.5.7]. Download RUST v2366_15.12.2022 OnLine
The only secure and legal way to play is through official platforms. If you are trying to find this specific
The update from December 2022 introduced several transformative features that define the game today: Download RUST v2366_15.12.2022 OnLine