The gift certificate for ordering Mimic is supposed to be good for one year so you should have plenty of time. I had the same question about where to place the code because it wasn't in the same place as before. Mine was on the email invoice just below the line showing my purchase of Mimic.

Poser 2, 3, 4, 5, 6, 7, 8, 9, 10, Pro 2014, 11, 11 Pro