When a machine with a Flashbuilder installation crashes or is wiped or when a harddisk is replaced etc. I have not found a way to get the deactivate menu item active again... So is this activation lost forever?
The same problem to be. I am in contact with the Adobe support, but no solution up to now.
I got on a chat with Adobe support and they freed up my lost account! There is indeed no way you ca do this yourself.