You will only receive a VAT-free invoice if you are entitled to one. During the checkout the VAT amount will be calculated.
For this to work properly, your VAT number must be entered correctly; you can do this in the contact details in your account. So check this well!
Have you had a product delivered to a country that is not listed?
Then we cannot provide you with a VAT-free invoice. In that case, we would like to refer you to the tax authorities in the country where you import the goods.