Open the Vivlio software.
To add a book that is already on your computer to the Vivlio reading software, drag and drop it. You can also click on “Library” and then “Import a file to the library”.
To find all your ebooks purchased from your bookstore, click on “Login”, choose your bookstore, and log into your customer account by entering your username and password used to purchase your ebooks.
You will then find all of your ebooks ...
... and you will be able to access your usual e-bookstore via the button in the top right: