For Chinese users, Omni 2.5 and OmniCode 2.6 bring fixes to the licensing system so I think now you will be able to 'Start' your trial period.

If you've already spent your 15 trial period, use the following keys to register for another 7 days trial (make sure to download the lastest version of these tools):

Omni v2.5:

7DaysTrial
LJAJ3-YT4S7-V3W2A-4APW6-H5CAG

OmniCode v2.6:

7DaysTrial
NJAKB-5QVW7-9RN28-M9MKR-DWSQC