Since this game was originally released for PlayStation 3 and Xbox 360, PC versions are technically not official ports; they are usually the console version running via a PS3/Xbox 360 emulator (like RPCS3) packaged into a compressed installer.
Since Dragon Ball Z: Ultimate Tenkaichi was never officially released on PC, the "PC version" you download is actually a PlayStation 3 or Xbox 360 ROM designed to run via an emulator (usually for PS3 or Xenia for Xbox 360). Here are the real specs you need:
High-quality versions often come pre-patched to fix "black screen" errors.