On May 14, 2009, a demo of the game was made available to those that had pre-ordered the game from , although it was made available for everyone to download later that month via or . The demo features a three-round exhibition match between and in the wake of their . A tutorial mode is also accessible at the beginning of the demo, which is featured in the final release.
On August 27, 2009, a new updated demo was released. It now features a ten-round exhibition match between and , in addition to the previous Hatton vs. Pacquiao match. It also features the return of the classic control scheme for the game where players can use the controller buttons for most controls instead of the right analog stick. This control scheme was originally in all previous Fight Night games, and it was brought into Fight Night Round 4 after fans were complaining about using the new control scheme and sufferings form clusters.
- On July 27, 2009, the first piece of downloadable content for Fight Night Round 4 was released. It is free of charge, and includes a new training gym, new gameplay sliders, new equipment and an alternate version of .
- Additional trunks, gloves and shorts were released along with face button control support in a free update at the end of August
- The next piece of downloadable content, the Boxer Pack, contained , and , as well as alternate versions of and George Foreman was released on 27 August and can be purchased through the and
- In early December, a new pack including , , and two new modes (Old School Rules & Ring Rivalries) was released for the PlayStation 3 and Xbox 360