Hi NatoBoomerang. I fear that this MOD is not working properly, even if the folder paths are fine. It seems that for some aircraft works and not for others. I have not tried them all but my recommendation would be to stop using it.
For the F-15 mod if running, also for the Su-25A and Su-25T. For the Su-27 and Su-33 is not working, it does not work for the TF-51 and P-51.
The problem must be a bug, because the textures, placed in the appropriate folder should work, but it seems that DCS is not charging texture reflection on all aircraft, including the original texture.
The route of the texture for the F-15 is:
\ Mods \ aircraft \ Flaming Cliffs \ cockpit \ Textures \ F-15C-CPT-TEXTURES \ (Texture here)
"F-15C-CPT-TEXTURES" folder you create yourself, paying attention to the name of the folder, you must have the same name as the compressed file.
If you use JSGME, you must modify the paths to work on airplanes I mentioned, but I have not tried others including mod.
For those who want to know, airplanes are not included in the mod is because I have no these modules, and can not edit your files.