GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#g2 f1 n1 c1 % almost decomposable bravais-group 3 % generator 1 0 0 0 0 1 0 1 0 3 % generator 0 0 1 -1 0 0 0 1 0 3 % invariant form 4 0 0 0 4 0 0 0 4 3d0 % additional normalizer 1 3d0 % centralizer -1 2^4 * 3^1 = 48 % order of the group dim3/3b