Meaker
RooMan is right: you do not install the Lancaster (as well as any new plane) by JSGME.
Just drop folders "01__Weapons_USA_GB" and "06__Avro_Lancaster_v3.3" inside your "#SAS" folder, then add to your air.ini (located at path: "C:\...\IL-2 Sturmovik 1946\#SAS\STD\com\maddox\il2\objects") following line:
Lancaster air.LANCASTER 1 NOINFO gb01 SUMMER
then open plane.properties (located at path: "C:\...\IL-2 Sturmovik 1946\#SAS\STD\i18n") and add what follows:
Lancaster Avro Lancaster Mk.III, 1942
lastly, open weapons.properties (located at same path of plane.properties), adding what follows:
#####################################################################
# Lancaster
#####################################################################
Lancaster.default Default
Lancaster.16x250 16x 250lb Bombs
Lancaster.24x250 24x 250lb Bombs
Lancaster.8x500 8x 500lb Bombs
Lancaster.12x500 12x 500lb Bombs
Lancaster.4x1000 4x 1000lb Bombs
Lancaster.6x1000 6x 1000lb Bombs
Lancaster.1x4000 1x HC-4000lb Bombs
Lancaster.1x12000 1x 12000lb 'Tallboy' Bombs
Lancaster.PathfinderRed 6x TIRed Flares
Lancaster.PathfinderGreen 6x TIGreen Flares
Lancaster.PathfinderYellow 6x TIYellow Flares
Lancaster.PathfinderOrange 6x TIOrange Flares
Lancaster.none Empty
CAUTION! Open those files by Notepad, but click just "Save" to save and not "Save as...", otherwise they will be transformed in text file, unusable.