If have say 6 pics will only work if stack three pics at a time and stack the two stacked pics. Have ryzen 7, asus mothebaord, 8gig ram, 1060 vid card.
Found my own answer. If you download older version i.e. CombineZM it does work but slowly and you have to manually save the ouput. But at least you get an output. Tried with 13 image stack, worked.