These files are from Ger Arkin I: getar0.odf, getar2.odf, getar5.odf, getar6.odf, getar7.odf, getar8.odf, getar9.odf, 
getar10.odf and getar11.odf.  If you have Get Arkin I in your addon directory, you can choose not to overwrite them when installing this mission.