Your user name and password are used to log into the website in future.
Your user name is also used to assign any software licenses to your account.
If you are an existing customer running V3 software and you want to upgrade to the latest version, you must use the UserName that you were assigned with your V3 license.

Your email address is used to send you confirmation emails, and allows you to reset your password on your account.
We need your VAT number if you are a business registered in the EU but not the UK, and want to be able to purchase without having VAT added to your invoice.