Do I get this version too (ps4 game)?

So I've just read that on Playstation Play at home you will soon get Horizon Zero down for free, and also the expansion The Frozen wilds

So I already bought this game but not the frozen wilds edition and my question is now

Do I also get the frozen wilds edition? Because I already bought the game on CD, but as I said, I didn't buy the frozen wilds edition

Yes you get, this is an extra download and not included in the download of the game

Okay, but how do I download it on April 20th

You go to the store and then you can download it for free from the section where it will be