Hello,
I want to update FPD, but can't find Purchase code.
Where is it?

You can find it in your envato purchases overview, under the purchase of FPD. Please note that the update feature via the wp-admin was broken by an API update through envato shortly after we introduced it  - You will have to make the last update manually (after that the update feature should work again). Simply download the plugin again from envato, uninstall the old version and install the new one - no data or products is lost.

Thanks!