Step 1. Navigate to www.Punchsoftware.com
Step 2. Select the product choice, such as Home and Landscape Design Architectural Series v17, but do not click the “Add to cart” link.
Step 3. Click the “Display Upgrade Options” link. Usually found above the "Buy Now" button.
Step 4. Select the item that pertains to your choice. Make note it must pertain to your previous version and if you want a download or CD in Sleeve.
Step 5. Enter the Serial Key in the text box from your previous version. Click Close
Step 6. Click “Buy Now” without clicking any options for full price.
This should provide the upgrade version you choose. If you get a message such as “That Product could not be found. This is the Topic Named: Productnotfound. You edit this in the ADMIN site.” then you have selected the wrong upgrade or entered the serial key incorrectly.