Just copy / paste all the FILES in the SMALL TEXTURES Folder into your main track Folder ( C/Sierra/gpl/tracks/AAIOM Folder )

To reinstate the larger textures, reverse the process by copying / pasting all the FILES in the ORIGINAL LARGE TEXTURES Folder, into your AAIOM Folder allowing them to overwrite all the small textures.

CARE: Do NOT paste these files in the Options Folder or its Sub Folders. These files need to be placed in yor main AAIOM Folder.!