It is the fourth installment. To follow the story correctly, the order is: Die Hard 2 Die Hard with a Vengeance Live Free or Die Hard (2007) A Good Day to Die Hard unrated vs. theatrical Live Free or Die Hard (2007) - IMDb
Let’s cut to the chase:
Directed by Len Wiseman (known for the Underworld films), Live Free or Die Hard was based on a 1997 Wired magazine article titled "A Farewell to Arms" by John Carlin. Production was stalled for years, partly due to the 9/11 attacks, which made the original script’s themes too sensitive. The film's title itself is a reference to New Hampshire's famous state motto, "Live Free or Die". die hard 2007 filmyzilla
