Mosvalve
There is not going to be an offline authorization. I'm not buying it. Bandlab wants everyone to use the new version because that's what they own. There is no reason for them to give us authorization for Sonar Platinum. This is what I believe now.
I suspect they believe that at some point CbB will be a more compelling program than 2017.10, so people will voluntarily switch to a better program that's free. Remember that if you use MIDI, MPE is already here and MIDI-CI has been ratified. Additions to the MIDI spec with higher resolution are slated by the end of the year. Granted, none of this obsoletes previous MIDI gear or software (the MMA and AMEI have made that a priority) but I think by next year at this time, 2017.10 is going to look pretty long in the tooth. And who knows what Windows will have done by then.
Whether there's an offline authorization for the remaining users, BandLab just keeps the authorization servers going, or they end up feeling it's the same situation as 32-bit users and there aren't enough to justify spending time on them, I have no idea. The main point is there is an exit strategy for existing users, which is to download the program that will be supported in the future.
I have no dog in this fight. I work with several companies and am using multiple programs because my main activity these days is writing books, and I need to know how all the programs work more than ever. My opinion is based not on how things are now, but how the industry will be in a year and how the users and the company will react to ongoing changes. My predictions don't come with a guarantee, but I've had a pretty good track record.