Buy Ebook click add 
After selecting the ebook you add to the cart and payment
Update your information and proceed with the payment
Payment is complete will have an email sent to you in the mail with download information

Method 1: Email send complete

You right mouse button click => choose Open link in new tab
The download link will open and download automatically

Method 2: Use account website when login

Login with the password sent to the mail
After logging in, name account show you click account on the website
Click tab download on manager account 
You left mouse button click to download link ebook
If the download link requires SSL with Destop, follow the instructions image below
If the download link requires SSL with Mobile

Screen display as show image below