There are three different formats available:
pdf - This can be opened and saved on all computers and devices. Double click the prompt below and it should open automatically
Mobi - This is the suitable format for Kindles/ Kindle app. Double click on the prompt and download the file onto your computer or, alternatively, email the file to your Kindle address. It should then automatically appear in your library
ePub - This is the suitable format for most tablets and iOS devices (Apple). Double click on the prompt and download the file onto your computer