After purchasing NSv, you will receive an email with a serial number and Authentication Code. Log into mysonicwall.com (refer to Creating a MySonicWall Account) and go to the Download Center:
To download image
Login to MySonicWall.com and then navigate to My WorkSpace > Downloads Available.
Click List All and the list of available downloads comes up.
Identify the NSv product and click on the title; when the details appear, click the download symbol to download:
Keep the serial number and Authentication code from the purchase confirmation email to complete product registration after the virtual machine in installed. Refer to Registering the NSv Appliance from SonicOS.