none of magicland's content was made for an new enough version of TRS to have flashing ditchlights. If you would like to make them work you need to use attachment maker by PEV to add the a.ditch# attachment points. If magicland mapped standard headlights to the ditchlights then there isn't much you can do (there is something you can do, I did it with my P42s, but it is highly not recommended because you can really mess up the file.
peter