How to enter activation code AFTER I've used email

I didn’t notice activation code at first, so I’ve activated software with my email address. Well, this is a limited feature freeware. I’d like to see the full version, and I found the activation code - but now I can’t figure out how to “upgrade” it for full trial

[reply=“Vitaly Kozadayev;d1345”] You should see the corresponding window upon each launch of the freeware version: