I have the same issue. Help me please.
I bought license of version 13, and upgrade twice (version 15 & 16).
Now I used PD 16 in a new Mac, I inputed the version 16 upgrade key, the app asked previous key, and i inputed version 14 key, it prompt not accepted. Same as version 13 key.
I bought license of version 13, and upgrade twice (version 15 & 16).
Now I used PD 16 in a new Mac, I inputed the version 16 upgrade key, the app asked previous key, and i inputed version 14 key, it prompt not accepted. Same as version 13 key.