Version 1.19 of K4PC is just starting to roll out. Currently version 1.14 from December 2015 is still supported. I suspect that it will be many months before all of the versions of K4PC without KFX are blocked from access. There is still time to download already purchased books and for tools to be developed to work with KFX, if there is enough interest.
I am not worried personally. I still have a working K3 Keyboard registered to my account.
