You are Geralt of Rivia, mercenary monster slayer. Before you stands a war-torn, monster-infested continent you can explore at will. Your current contract? Tracking down Ciri — the Child of Prophecy, a living weapon that can alter the shape of the world.
The patch contains only official 1.31 and 1.31 GOG GOTY scripts and only official fixes which are available to GOTY users. If you have non-GOTY version of the game, installing the patch will make your game almost identical to GOG GOTY. If you already have GOG GOTY version of the game, this patch will ensure your game is backwards compatible with non-GOTY while still keeping all GOTY changes and fixes. In other words, Unification patch makes both game versions identical, allows mod makers to release single version of their mods and saves mod users from mod version/game version conflicts.