MUGEN is a highly customizable 2D fighting game engine. Because it is open-source, there are hundreds of different "versions" of Anime Crossover games created by fans. "V2.6" likely refers to a specific build by a creator (often found on YouTube or gaming blogs). These games are typically free fan-projects and should not be confused with official commercial products. Download Far: Cry 4 Patch 19 Free Repack