The specific version number v0.3.5.1 corresponds to a very early build from the game's Early Access period (roughly early 2022). For comparison, the game has since moved through seven major themed updates—such as Update 5: Badwater and Update 7: Ziplines & Tubeways —before its official launch. Review & Security Risks

Downloading .rar files from unofficial sources carries a high risk of malware or unwanted software. Official versions are exclusively available through platforms like Steam, GOG, and the Epic Games Store.

This version (v0.3.5.1) lacks years of content, including the Iron Teeth faction reworks, 3D water physics, "Badwater" toxic mechanics, and modern automation features.

For the best experience, you should check out the latest Timberborn 1.0 on an official store, as it includes the complete "lumberpunk" city-building experience with overwhelming community support. Timberborn Patches and Updates - SteamDB

The file "Timberborn.v0.3.5.1.rar" appears to be an unofficial or potentially pirated distribution of the city-builder game , which is currently in its full Version 1.0 release .

Early experimental builds are often unstable and may not run well on modern systems or the Steam Deck, which the official 1.0 version fully supports.