All I did was open the cs777_6_T.DDS with DXTBmp.exe (ALT > Image > Send to Editor (which is MSPaint.exe)), copied the lower half of the image (the top half was blank), then pasted it back in the top half. I saved the changes, then reloaded them into DXTBmp.exe (ALT > Image > Reload after Edit). Then I save the modified cs777_6_T.DDS.
This was back in v1.1/1.2, but in v1.4, I don't need to do this, but the engines look more like GE engines, than RR engines, and the Qantas Flying Kangaroo is on the outer side of the left engine, but the inner side of the right engine, so I'm not using the Qantas livery for the RR variant any more. I do not remember it looking like that in the earlier version, but I might not have been looking closely enough back then!