In marketplace, I used the search filter to display results priced low to high. I select a free world to download. I first try the international space station, then the stonehill castle, the human body, marine biologist, safari. Each time, it briefly displays the processing payment box, then the message box “something went wrong. we were unable to complete your purchase. maybe check your internet connection” The internet connection is fine. I have previously purchased the free Mount Olympus world without issue.