It's called V2 only to not have users confusing it with the old KLAX made by Cloud9 for FS9, since there's an FS9 version of the FSDT KLAX too, and in order to not have the two confused even in the software, the name *had* to be different.
So, it's version 1.6.7 of "KLAX V2", which is just the name of the product.