I am thinking maybe because I bought Impluse .....
Impulse is not for sale it is free.
Did you purchase ObjectDock using a PayPal email address different than your Impulse/Stardock.net login email?
If so you will need to transfer the registration from your other email address to your Impulse/Stardock.net account - Transfer Registrations
After this is done then re-login to Impulse.
If this doesn't fix your issue then email support@stardock.com and include a link to this forum post.
As this is the weekend, you may need to wait until Monday at the earliest for a response.