Adobe Captivate is not part of the creative suite licence. You need to have a separate subscription that applies to Captivate itself.
After buying one, I came with the bad surprise that Captivate was still asking for a serial number and was still counting remaining days before my trial version expired.
It was very bad news because without a licence, all published projects get locked and unusable after the trial expiration date, meaning impossible to work and deliver anything to any client with the trial version !
I tried several options like uninstalling the trial version then install the one from my adobe account page, having a long chat with adobe support, sign out and sign in from Captivate or creative suite… nothing was working.
I then came across a post on reddit telling to delete a few folders:
I uninstalled Captivate, removed these folders, reinstalled Captivate and… tada it worked !
So glad to be able to find a solution after so many hours of stress, I had to share it here. I hope that it might help other users who come with the same problem.