To export a list of products purchased by a registrant:
Go to the Event Manager App > Registration section.
You can access the Export button from the Registrants and Worksheet tabs.
Click the Export button on the top right.
From the Export registrants pop-up, select the desired Registrant Type. You'll want to select the Registrant Type associated with the form that contains products you wish to export.
Click OK.
Open the export .CSV file (using Excel).
You'll see a list of participants along with a "Product x: ..." column for each product, or product / variant combination, that was included on the registration form. The product columns show the total quantity purchased by that registrant.