how can u update the game idk ho
It won't update on its own if you downloaded it from here; you need to download the new version manually in that case. If you use the itch.io app (https://itch.io/app) it'll update on its own.
If you downloaded the game from here over 6 days ago, you need to download the new version. To do that you just download the game again. If you want it to update automatically you can use the Steam key and add it to Steam or use the itch.io app: https://itch.io/app