The file is okay (since I could dled it without problems).
But why bother? ;) :

// Persistence Of Vision Ray Tracer Scene Description File
// File: isofortony.pov
// Vers: 3.5
// Desc: Povray 3.5 demonstration scene
// Date: 4 October 2001
// Auth: Jonathan Rafael Ghiglia - isosurface equation by Warp
//


// SWITCHES
#declare AREA_LIGHT=on;
#declare PHOTONS=on;

global_settings {
        max_trace_level 15
        #if (PHOTONS) photons {count 1000000 autostop 0} #end
}


camera {
        location <-2,3,-3>
        //right x
        look_at 0
}

light_source {
        <4,5,-5>
        rgb <1,1,.98>*2.5
        //rgb <.98,1,1>*2.5
        fade_distance 5
        fade_power 2
        #if (AREA_LIGHT) area_light x,y,6,6 adaptive 0 jitter circular
orient #end
}

light_source {
        <0,3.5,5>
        rgb <1,.9,.6>*0.6
        //rgb <.6,.9,1>*0.6
        fade_distance 5
        fade_power 3
        #if (AREA_LIGHT) area_light x,y,5,5 adaptive 0 jitter circular
orient #end

}


sky_sphere { pigment {rgb <.7,.85,1>*0.5}}

plane {
        y,0
        pigment { rgb 1 }
        finish {
        ambient 0
        diffuse 0.5
        specular .4
        roughness .01
        reflection .1 }
}




#include "functions.inc"


#declare BUMP = function {pigment {crackle color_map {[0 rgb 0][1 rgb 1]}
turbulence 0.5 cubic_wave}}
#declare TORUS = function
{sqrt((sqrt(x^2+z^2)-1.5)^2+y^2)-(.3+.2*sin(8*atan2(x,z)))}

isosurface {
        function { TORUS(x,y,z)-BUMP(1.5*x,1.5*y,1.5*z).red*0.19}
        contained_by { box { -<2,.5,2>,<2,.7,2> } }
        max_gradient 6.272
        //evaluate 1,10,0.99
        accuracy 10^-3
        translate .5*y
        scale .7
        pigment {rgb <1,.6,.2>*0.7}
        finish {
        ambient 0
        diffuse 0.1
        specular 3
        roughness 0.04
        reflection {0.5 metallic}
        metallic
        brilliance 1.5}
        #if (PHOTONS) photons {target reflection on refraction off collect
off} #end
        }

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