The installer will not redownload this file everytime, only when I update it or when you select to clean up dlc folder. So you don't have to do anything extra.
Maybe there is a way, but I don't know any other methods, the only one I found out is to remove whole chat window from the game, this is what does my mod.
v5.6.0.02 (31-05-2016):
- added standalone Training Room [this one is compatible with the new minimap mod with ship names]
- updated contour icons: Atmaxx, MajorRenegade, Aslain (rework), Panzerleiter
- updated Japanese Voice Pack (by Flamefang)
- disabled outdated contour icons
- fixed installing Mebius crosshairs