Make sure you are logged-in to Impulse with the email used to purchase ObjectDesktop then click the blue question mark (top right) and select 'Register a product with Impulse....". In the screen that opens you should have Object Desktop listed in the Registered Applications. If not click 'Add Registration' at the bottom of the window.
Fill in the info required Product Category = Desktop and Product = Object Desktop
You may need to restrat Impulse after completing.
If that doesn't resolve your issue then please email support@stardock.com and initiate a trouble ticket.
Stardock Sales and Support are open Monday - Friday (9am-4pm EST). Every effort is made to respond to queries as quickly as possible, though emails sent after-hour and on weekends will generally not be seen until the following work day.