You are right Tobias, downloading ATM

First fast report:
Mk VI ok (shows up and flies)
Mk Vc late gives CTD at 20%, with these logfile lines:
Spawn.get( com.maddox.il2.objects.air.SPITFIRE5C2LTrop ): com.maddox.il2.objects.air.CockpitSpit5_C12
java.lang.NoClassDefFoundError: com.maddox.il2.objects.air.CockpitSpit5_C12
at com.maddox.il2.objects.air.SPITFIRE5C2LTrop.class$(SPITFIRE5C2LTrop.java:16)
at com.maddox.il2.objects.air.SPITFIRE5C2LTrop.<clinit>(SPITFIRE5C2LTrop.java:83)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.maddox.rts.Spawn.get(Spawn.java:39)
at com.maddox.rts.Spawn.get(Spawn.java:28)
at com.maddox.il2.game.Main.preloadAirClasses(Main.java:214)
at com.maddox.il2.game.Main3D.beginApp(Main3D.java:1540)
at com.maddox.il2.game.Main3D.beginApp(Main3D.java:1475)
at com.maddox.il2.game.MainWin3D.beginApp(MainWin3D.java:212)
at com.maddox.il2.game.Main.exec(Main.java:405)
at com.maddox.il2.game.GameWin3D.main(GameWin3D.java:235)
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.maddox.il2.game.Main.preloadAirClasses(Main.java:216)
at com.maddox.il2.game.Main3D.beginApp(Main3D.java:1540)
at com.maddox.il2.game.Main3D.beginApp(Main3D.java:1475)
at com.maddox.il2.game.MainWin3D.beginApp(MainWin3D.java:212)
at com.maddox.il2.game.Main.exec(Main.java:405)
at com.maddox.il2.game.GameWin3D.main(GameWin3D.java:235)