Replaced hard drive with a 240GB SSD and installed Windows 10-64. Installed command center, and then Sonar. But the Sonar stayed in demo mode. I did as shown on video (( On the website Cakewalk.com "Activate file" is not downloaded. Guys tell me what else I can try ? Thank you.
 
P/S - Sorry, I badly know English (

Hi, and welcome to this forum. Is your pc connected to internet? If connected, you should be able to activate through CCC. Have you tried to log in and out of CCC? Have you tried to reboot your pc, and then try to log in / out of CCC?
Best of luck. 
Edit: https://www.cakewalk.com/...-Offline-Authorization

Zargg71
Hi, and welcome to this forum. Is your pc connected to internet? If connected, you should be able to activate through CCC. Have you tried to log in and out of CCC? Have you tried to reboot your pc, and then try to log in / out of CCC?
Best of luck. 
Edit: 

Hi, Zargg71 ! The computer connected to the Internet. In the Command center I went, but nothing happened. Then I tried to do what was shown in this video. Nothing happened - the SONAR DEMO

Did you log in to CCC with your Cakewalk account ID? Did you try to log out / in again? Did you reboot after installing CCC / SONAR? Are you sure you are not looking at the demo products available, and not your connected products in CCC? What happens if you click the gear icon on the top right corner in CCC and click check now?
All the best.

Did you log in to CCC with your Cakewalk account ID?  - Yes
Did you try to log out / in again?  - Yes
Did you reboot after installing CCC / SONAR? - Yes
Are you sure you are not looking at the demo products available, and not your connected products in CCC?  - 2 pictures of my CCC  
 
The serial number on the pictures deleted on purpose
 
What happens if you click the gear icon on the top right corner in CCC and click check now? - Clicked, but nothing happened.