The generator matrix

 1  0  0  0  1  1  1  0  1  1  1  1  0  0  1  1  1  1  1  1  1  1  0  0  0  X  X  X  0  X  X  0  0  X  X  X  X  1  1  1  1  1  1  1  1
 0  1  0  0  X  1 X+1  1  0  1  X X+1  1  X  X  1  X  1  0  0 X+1 X+1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1  0  X  1  X X+1 X+1
 0  0  1  0  0  0  0  X  1  1  1  1  1  1  X X+1 X+1  X  X X+1 X+1  X X+1 X+1  1  X  0  1  X  0 X+1  0  1  X  0  X  1  1  X  X  0  1  1 X+1  X
 0  0  0  1  1 X+1  X X+1 X+1  0  X  1  1 X+1  0  1 X+1  X  1  X  0 X+1  0  X  X  0  1 X+1  0 X+1  1  1 X+1  X  X X+1  1  0  1 X+1  X  X X+1  1  X

generates a code of length 45 over Z2[X]/(X^2) who´s minimum homogenous weight is 42.

Homogenous weight enumerator: w(x)=1x^0+86x^42+76x^44+44x^46+7x^48+20x^50+10x^52+4x^54+6x^58+2x^60

The gray image is a linear code over GF(2) with n=90, k=8 and d=42.
As d=42 is an upper bound for linear (90,8,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 8.
This code was found by Heurico 1.16 in 0.153 seconds.