One thing to note, if you copy the upgraded files straight into the original folders, any textures that Gman has moved to a shared texture folder will remain in individual folders untouched, so FSX will use those first before looking in the shared texture folder defined in the texture.cfg.
I've only just begun to understand how all these textures work. I'm not quite clear on a couple of things I've noticed after installing gman's enhanced textures. Taking the Prinair livery for example, there exists a file within the specific Prinair texture folder"144_Wings.dds" that is 22k large and appears to be in 4096 DX5 format. In the common 'texture' folder however, this identical file exists also, but it is 87kb large and seems to be in 4096 32-bit. Are you suggesting that the smaller DX5 file is what fsx is using for this specific texture when loading the Prinair livery, ignoring the larger 32-bit one? Does this seem correct? Should fsx not be using the larger, presumably more detailed file? I've noticed several examples of files
duplicated as between the common and more specific texture folders.