So it was confirmed that it was in fact a typo regarding the "instalment" for DOA's DLC. But yet the best part was that some of the peeps in here were like "well it's spelled differently elsewhere", no shit sherlock, but yet it wasn't the intentional way of writing it out that way, they could of completely missed any other letter.
Also fun fact, DOA5 had errors with spelling so uh, get pogged.