Congratulations on getting an Early Access key for Hyper universe! If you have received a 16 digit key that starts with "HU" (HUxxxxxxxxxxxxxx), your key is for the Nexon Launcher and can only be redeemed there.
Nexon Launcher download
Once you install the Nexon Launcher and log into your Nexon Account, click the drop-down menu to select “Activate a Product.“
Hyper Universe will have a 16 Digit Product Code that you can activate by entering it in the Activate a product menu.
Once you click “Next” Hyper Universe will appear in your Nexon Launcher and begin to install. Once the download has finished click play and jump in!