i bought this game when it was released at 5$ do i really have to buy it again for 7$ ?
No, read this article, please. All you need to know to get access to the downloads is in it:
I wrote this article. All you need to know to get your steam key is in it.
https://jni.itch.io/ancient-warfare-3/devlog/18776/steam-release-update-15