1. Unpack the file and place the "696969" folder into your "DLC" folder for Dead or Alive 5 Last Round
2. Open up your launch .ini configuration, which should be located in your game's root directory along with the executable (3DMGAME.ini, steam_api.ini etc.).
3. You should see a section of the .ini for DLC. Simply add a new DLC line and make it equal "420700". So, for example if the last line of DLC reads "DLC007=358144", add a new line that reads "DLC0XX=696969".
4. Launch the game and enjoy.