Thank you for your email.
We still have this promotion on going. You can register it from the website. And once you registered, it require 4stays or 9 nights in the following 90 days from the registered date, when you qualify, then your account will be upgraded automatically.
Please make sure that you registered this promotion successfully when you decide to start the Fast Track.
For further assistance, please let me know.
Reservations Sales Representative
Hilton Reservations & Customer Care
Bund Center #4204
222 Yan An Road East