How to increase Temporary Register limit.

Hello guys please someone help me,I am trying to use Easy Roads 3D and when ever I decompile the package and import it I get an error

"Shader error in 'Hidden/Scene View Show Mips': Temporary register 
limit of 8 exceeded; 11 registers needed to compile program "

Please is there anything else I could use or do to solve this.

I’m having similar issues with Unity 5.5 (except that in this case, I’m using 4 registers and the limit is 2!). Little bit of googling shows that this limit can be changed in GSL from:

#pragma profileoption NumTemps=64

Unfortunately, from unity documentation (Unity - Manual: HLSL in Unity), profile option is not supported by ShaderLabs.

Back to square 1, if anyone has any idea…