GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#g2 f3 % almost decomposable bravais-group 4 % generator 1 0 0 0 0 -1 0 0 0 0 0 1 0 0 1 0 4 % generator 0 -1 0 0 1 0 0 0 0 0 0 1 0 0 -1 0 4 % invariant form 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 4 % invariant form 0 0 1 1 0 0 1 -1 1 1 0 0 1 -1 0 0 4 % invariant form 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 2^3 = 8 % order of the group dim4/2-1,2-1b