I really don't understand how to use the packs i tried activate i tried looking in shop if the items became free. I don't have the items in my inventory either. Is it bugged? Or am i doing something wrong? (I bought the hunter pack just if it's any specific purposes.)

well the item has its own description.
"unlock this into your inventory"

so you should have a button for it.

What button activate? or? i don't see a button saying something like unlock items... What is it called?

Pretty sure there should be a button saying unlock.

Maybe you need to activate it first.

"Unlock" button is near the "Activate" button.
Once you unlock a pack it'll become a set with full Hunter which can be activated.

Wait wut? o . o

There's an unlock button... It's not there for me and when i click the activate button it says "Hunter Pack cannot be used ingame." Is something broken for me?

Yeah, weird.
Will look into it, sent you items manually.

Thank you.