Unity making existing shader partially transparent

This shader is supposed to be partially transparent, I followed the step by step at this post http://answers.unity3d.com/questions/244837/shader-help-adding-transparency-to-a-shader.html but it didn't work. Can someone help me with this?

Code:

 Shader "UnityCoder/OldFilm1"
 {
 Properties {
  _MainTex ("Color (RGB) Alpha (A)", 2D) = "white"
  
 SepiaValue("SepiaValue", Float) = 0
 NoiseValue("NoiseValue", Float) = 0
 ScratchValue("ScratchValue", Float) = 0
 InnerVignetting("InnerVignetting", Float) = 0
 OuterVignetting("OuterVignetting", Float) = 0
 RandomValue("RandomValue", Float) = 0
 TimeLapse("TimeLapse", Float) = 0
  
 }
 SubShader {
 Tags { "Queue"="Transparent" "RenderType"="Transparent" }
 LOD 200
  
 CGPROGRAM
 #pragma target 3.0
 #pragma surface surf Lambert alpha
  
 sampler2D _MainTex;
  
 uniform float SepiaValue;
 uniform float NoiseValue;
 uniform float ScratchValue;
 uniform float InnerVignetting;
 uniform float OuterVignetting;
 uniform float RandomValue;
 uniform float TimeLapse;
  
 struct Input {
 float2 uv_MainTex;
 };
  
 /// <summary>
 /// Computes the overlay between the source and destination colours.
 /// <summary>
 float3 Overlay (float3 src, float3 dst)
 {
 // if (dst <= O) then: 2 * src * dst
 // if (dst > O) then: 1 - 2 * (1 - dst) * (1 - src)
 return float3((dst.x <= 0.5) ? (2.0 * src.x * dst.x) : (1.0 - 2.0 * (1.0 - dst.x) * (1.0 - src.x)),
 (dst.y <= 0.5) ? (2.0 * src.y * dst.y) : (1.0 - 2.0 * (1.0 - dst.y) * (1.0 - src.y)),
 (dst.z <= 0.5) ? (2.0 * src.z * dst.z) : (1.0 - 2.0 * (1.0 - dst.z) * (1.0 - src.z)));
 }
  
 float3 mod289(float3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
 float2 mod289(float2 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
 float3 permute(float3 x) { return mod289(((x*34.0)+1.0)*x); }
  
 float snoise (float2 v)
 {
 const float4 C = float4(0.211324865405187,  // (3.0-sqrt(3.0))/6.0
 0.366025403784439,  // 0.5*(sqrt(3.0)-1.0)
 -0.577350269189626, // -1.0 + 2.0 * C.x
 0.024390243902439); // 1.0 / 41.0
  
 // First corner
 float2 i  = floor(v + dot(v, C.yy) );
 float2 x0 = v -   i + dot(i, C.xx);
  
 // Other corners
 float2 i1;
 i1 = (x0.x > x0.y) ? float2(1.0, 0.0) : float2(0.0, 1.0);
 float4 x12 = x0.xyxy + C.xxzz;
 x12.xy -= i1;
  
 // Permutations
 i = mod289(i); // Avoid truncation effects in permutation
 float3 p = permute( permute( i.y + float3(0.0, i1.y, 1.0 ))
 + i.x + float3(0.0, i1.x, 1.0 ));
  
 float3 m = max(0.5 - float3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0);
 m = m*m ;
 m = m*m ;
  
 // Gradients: 41 points uniformly over a line, mapped onto a diamond.
 // The ring size 17*17 = 289 is close to a multiple of 41 (41*7 = 287)
  
 float3 x = 2.0 * frac(p * C.www) - 1.0;
 float3 h = abs(x) - 0.5;
 float3 ox = floor(x + 0.5);
 float3 a0 = x - ox;
  
 // Normalise gradients implicitly by scaling m
 // Approximation of: m *= inversesqrt( a0*a0 + h*h );
 m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );
  
 // Compute final noise value at P
 float3 g;
 g.x  = a0.x  * x0.x  + h.x  * x0.y;
 g.yz = a0.yz * x12.xz + h.yz * x12.yw;
 return 130.0 * dot(m, g);
 }
  
 void surf (Input IN, inout SurfaceOutput o)
 {
  
 // Sepia RGB value
 float3 sepia = float3(112.0 / 255.0, 66.0 / 255.0, 20.0 / 255.0);
  
 // Step 1: Convert to grayscale
 float3 colour = tex2D(_MainTex,  IN.uv_MainTex.xy).xyz;
 float gray = (colour.x + colour.y + colour.z) / 3.0;
 float3 grayscale = float3(gray);
  
 // Step 2: Appy sepia overlay
 float3 finalColour = Overlay(sepia, grayscale);
  
 // Step 3: Lerp final sepia colour
 finalColour = grayscale + SepiaValue * (finalColour - grayscale);
  
 // Step 4: Add noise
 float noise = snoise(IN.uv_MainTex.xy * float2(1024.0 + RandomValue * 512.0, 1024.0 + RandomValue * 512.0)) * 0.5;
 finalColour += noise * NoiseValue;
  
 // Optionally add noise as an overlay, simulating ISO on the camera
 //vec3 noiseOverlay = Overlay(finalColour, vec3(noise));
 //finalColour = finalColour + NoiseValue * (finalColour - noiseOverlay);
  
 // Step 5: Apply scratches
 if ( RandomValue < ScratchValue )
 {
 // Pick a random spot to show scratches
 float dist = 1.0 / ScratchValue;
 //RandomValue *= _Time.y*10;
 float d = distance(IN.uv_MainTex.xy, float2(RandomValue * dist, RandomValue * dist));
 if ( d < 0.4 )
 {
 // Generate the scratch
 float xPeriod = 8.0;
 float yPeriod = 1.0;
 float pi = 3.141592;
 float phase = TimeLapse;
 //                    float phase = _Time.x*TimeLapse;
 //                    float phase = _Time.x;
 float turbulence = snoise(IN.uv_MainTex.xy * 2.5);
 float vScratch = 0.5 + (sin(((IN.uv_MainTex.x * xPeriod + IN.uv_MainTex.y * yPeriod + turbulence)) * pi + phase) * 0.5);
 vScratch = clamp((vScratch * 10000.0) + 0.35, 0.0, 1.0);
  
 finalColour.xyz *= vScratch;
 }
 }
  
 // Step 6: Apply vignetting
 // Max distance from centre to corner is ~0.7. Scale that to 1.0.
 float d = distance(float2(0.5, 0.5), IN.uv_MainTex) * 1.414213;
 float vignetting = clamp((OuterVignetting - d) / (OuterVignetting - InnerVignetting), 0.0, 1.0);
 finalColour.xyz *= vignetting;
  
 // Apply colour
 //gl_FragColor.xyz = finalColour;
 //gl_FragColor.w = 1.0;
  
 //half4 c = tex2D (_MainTex, IN.uv_MainTex);
 o.Albedo = finalColour;
 o.Alpha = tex2D (_MainTex, IN.uv_MainTex).a;
 }
 ENDCG
 }
 Fa