Hi,
I may be going a little off-topic here, however I am presenting my experience below, hoping it helps someone in similar situation:
Note: My PC has Windows 7 64-bit version.
1. When I started installation of Cakwalk Sonar thru Bandlab Assistant, the installation looked like it got stuck in "downloading (5/5)" stage.
2. I cancelled the above mentioned downloading by clicking on [X] icon next to the downloading message.
3. While searching thru Bandlab assitant app, I found the "downloads" folder where the files of states (1/5) to (5/5) were downloaded (Refer attached image)
4. I started Cakewalk Sonar setup file kept in same download folder. After usual setup installation process, Cakewalk Sonar got installed, however my PC hung up, so I re-started it.
5. When I started Sonar for first time, I saw an alert-window informing that the Sonar wasn't activated and I should activate it thru Bandlab Assistant. (At this moment, Bandlab Assistant was not started since after aforementioned re-starting of PC, Cakewalk Sonar was the only software started)
6. I started Bandlab Assistant software (while Sonar was still open in another window), and went thru its login process.
7. After sucessful login in Bandlab Assistant, I observed another alert-window, informing that Cakewalk has been activated. Though I have not tested it, I believe now the Sonar can create and save new files.
Hope the above helps others who have faced similar issue of "Sonar not activated"