The legitimate current software from ArKaos is GrandVJ and MediaMaster . Older versions like 3.6.1 are no longer supported or distributed officially.
ArKaos VJ is a family of real-time visual performance tools that have played a significant role in live audiovisual shows, club VJing, and multimedia art since the late 1990s. The file name you supplied — “Arkaos Vj 3.6.1 FC2.rar” — appears to reference a specific versioned distribution (3.6.1) packaged as a RAR archive and possibly indicating a crack/patch variant (“FC2” sometimes appears in release tags). This essay examines the software historically and technically, discusses likely characteristics of that package, explores legal and security implications, and assesses ArKaos VJ’s cultural significance.