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Get RunUO 3.1 - the most advanced UO server platform ever created. Over 23 years of innovation in a modern, production-ready package.

RunUO v3.1 - Latest Stable

Recommended for production servers

v3.1.0
Released: September 2025

Next-Gen Performance

Revolutionary server core with advanced memory optimization and multi-threading

Modern .NET 8 Framework

Latest C# 12 features, AOT compilation support, and enhanced cross-platform compatibility

Complete Content Library

Full OSI-accurate scripts, modern administration tools, and enhanced security features

Developer Experience

Improved debugging tools, enhanced scripting APIs, and comprehensive documentation

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System Requirements

Operating System
Windows, Linux, macOS
Runtime
.NET 8.0 or higher
Memory
512 MB RAM minimum
Storage
2 GB available space

Development Branch

Get the latest features and improvements before they're released. Not recommended for production use.

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Legacy Versions

Access previous stable releases for compatibility with older client versions or specific requirements.

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Quick Start Guide

Get your RunUO server up and running in minutes

1

Download & Extract

Download the latest release and extract to your desired location

2

Configure

Edit configuration files and set up your server preferences

3

Launch

Run the server executable and start accepting connections

View Complete Documentation