I'am a Adobe CC for photographer subscriber and I have activated the new Lightroom CC on my desktop computer and one of my laptops. Yesterday, I redeem a Lightroom 6 serial number from Leica product purchasing.
When I install lightroom 6 on my another laptop, the installer asked me to login using my Adobe ID to which my subscription bundled. I could not find a place to input the serial number and after I logged in, it activated as Lightroom CC but not Lightroom 6.
Thank you very much. It seems that I have to register a new Adobe ID.