I downloaded the letters Christmasfonts F and G, however, only the name of the font downloaded. I get a blank square when I toggle the letter choice. What can I do to replace these free fonts?

They arent blank, they are white.. you may need to put them onto a dark background somehow to see them....

You should contact the CuteEmbroidery Customer service (there is a link at the top of the Questions page) and ask there. Nobody here can do anything to help you since we are just fellow members and it is illegal to share digitial copies of the designs. Of course, the "quick and easy" way would be to purchase a 6 month membership and just download away on any designs you want/need. I know I've not been sorry for even a moment for buying mine. It is more than worth the money. =] I hope you get your situation resolved.