No luck here Steph.
You shouldn't need any fancy software to print these. Try taking a screen shot of the decal sheet you like, convert to a jpeg, open in Paint and adjust for the size you need using the "Resize" feature. Try this several times printing on plain paper until you get the result you want, then tape decal paper over the printed image, reload the same sheet of paper and print again. The pattern should now appear on the decal paper.