@shadowtwinz : I did some custom battles, played about twenty laps with Denmark without CTD or bug (except that there is no voice for this faction), I also played a dozen laps with France without CTD either ... friends I did not try Poland.
@sullivanclan1 : After installing SS6.4, simply overwrite the "data" folder (... / mods / SS6.3 / data) with the one in the SSHIP v0.9.6 folder. Do not worry about old versions.