This game requires that you own a Source engine game such as Counter-Strike: Source, Half-Life 2, or Day of Defeat: Source. Click here for a full list of games that meet this requirement. Please note that Portal: First Slice and the bundled Half-Life 2: Deathmatch do not fulfill this requirement.

If you do not already have a version of Situation Outbreak installed on your computer, simply download this file, run it and follow the simple on-screen instructions, then start/restart Steam when asked to do so.

Conversely, if you already have a version of Situation Outbreak installed on your computer, please manually remove your "so" folder from your steamapps/SourceMods directory of your Steam installation before attempting to install this release. Failure to do so will more than likely result in some serious issues.

What's new in v1.60? A whole lot. On top of the usual bug fixes and whatnot, here's a quick rundown of some of the highlights in no particular order:

New military soldier NPC for mappers
Three new weapons: the Benelli semi-automatic shotgun, Zombait!, and the AS50
New real-time ambient sound system, mood changes depending upon situation
New gamemode, Extermination, featuring the new Military team
Gib system replaced with gore - and lots of it
Smarter NPCs capable of opening doors and jumping to and from small distances
Reworked weight system, depends on weapon carried and current health
Improved incendiary grenade and other explosive-based weapons
Four new maps: so_sv_deadcity, so_ext_plague, so_ext_slums, and so_obj_mainstreet
New, totally reworked version of so_sv_chapel
Rehauled Infection gamemode, including new zombie classes for the Undead
Dramatically improved zombie knockback system, tied it to weapon damage
A new boss NPC: the ghost

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