Recreating Peculiar Shader Behavior from Unity 4 in Unity 5

Hi everyone,

I'm working with an artist on a project where they are taking advantage of some odd behavior of a shader in Unity 4 for visual aesthetics / behavior. This shader uses the TexGen feature which was depreciated in 5.0 and thusly breaking our nice glitchy effect. I know very little of shader programming at this stage and we're coming up towards our installation date in the next few weeks with this as our major last hurdle to clear. Would anyone out there be able to assist in helping us figure out how to reproduce this effect in Unity 5.0?

For the details, The shader we are using is the HardSurface/HardsurfaceFree/CutOut/OpaqueBump shader from https://www.assetstore.unity3d.com/en/#!/content/729

When applying this shader to a terrain and then lighting elevated sections with a point light we get some really interesting glitchy noise effects.