You can easily relocate the texture paths manually or simply rearrange the files to a flat file structure, so the model file would be located in the same folder as the texture files.
If there are any blender, sketchup, unitypackage, unreal project, keyshot, marmoset, fbx (with embed media) files, textures might be inside of them, in that case the Support team can extract the textures. If you still can not find the textures, the seller may have forgotten to upload them, in that case, please contact the designer or CGTrader Support.