GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
# ACEExample "perf602p5" : enumeration of cosets of H in G,
# where G = PerfectGroup(60*2^5, 2), |G : H| = 480, using
# default strategy.
#
local G, fgens;
G := PerfectGroup(2^5*60, 2);
fgens := FreeGeneratorsOfFpGroup(G);
return ACEfunc(
# arguments
fgens, RelatorsOfFpGroup(G), fgens{[1]}
# options
: echo, mendelsohn, max := 800, mess := 500);