Not working as promised.

In level 1— There is a simple word with about three letters. There are blanks where the letters go. The app is SUPPOSED to sound out the missing letter when the square is clicked on. Well it doesn’t and it’s not my computer because when i click on one of the alphabet letters the app sounds it out. My volume is working…this app is not. Also happens on other levels.
I emailed the support email of the app and they have not helped.

2012Mimi about Montessori Crosswords - Teach and Learn Spelling with Fun Puzzles for Children, v1.1