How do I use my license key to download Djay 2 on my I Pad?

Whiteout having to purchase the App! I got the key with Pioneer DJ wego,
When I try to download the app it asks me to purchase it!

Hey there,

I assume the key is for an older version of a djay Mac software, like djay 3.
Do you own a Mac?

Lukas E.

Hi, I am using an I Pad and got a key for Djay2 app , but I can’t download the app without paying for it (buying).