I mean, that you have to be logged in to download the software. This is a very unusual pattern and I don't understand the reason for it, since you still have to enter the key and email address when you start the installed software.
I had to google it and accidentally came across this forum post...
I believe these steps are normally implemented. For example if you purchase something via Steam, you will need to log in to your account to download, install and activate the software you purchased. Other software provider might be using different method, but this is how Stardock doing it for a long time.
Thank you,
Basj,
Stardock Community Assistant