In most community contexts (4chan's /h/ board, Hongfire archives, or the CM3D2/COM3D2 Discord servers), "cm3d2hairv2 full" refers to a community-compiled pack of . Version 2 typically includes fixes for clipping issues that plagued V1, as well as additional styles ranging from short bobs to sprawling twin-tails.
Delete the unzipped_mod_cache.dat file if it is present in your game root directory. cm3d2hairv2 full