Make sure the file you want to open has downloaded completely. Large files vary in how long they take to download, depending on the size of the file and the speed of your internet connection. Bundles in particular often consist of large ZIP files that may take longer to download. And if you’re using a school computer, please remember that some schools have downloading restrictions. If you’re having problems opening a file at school, you should contact a network administrator or download and open the file from your home computer.