registration

Hello, dear developers of this wonderful software!
I have recently switched up to 4K downloader from YTD and AllMyTube, which actually were not bad. Now, I can see that 4K downloader is someway easier to understand and more user-friendly.
To get an entire channel on youtube I need to have registration, but when I press registration button nothing happens. No website link is run and open. No action looks or sound up. Could you kindly tell me is there another way to register the product? Should I purchase it for registration?
Thanx a lot!