I wholeheartedly agree.
We have spent a lot of money on Sonar and I also paid for the Sonar Platinum Lifetime Updates in June 2016, along with many others.
I want to and need to be able to install or reinstall Sonar on any compatible Windows computer now and into the future.
Therefore, the licensing and authentication system needs to become an offline file-based or code-based authentication method that does not rely on an online system.
This is the very least we should be offered.
Regards,
Steve