There are a few ways to download Dual Universe (non- Steam version), you can simply head to the following page and access the download link there: https://www.dualuniverse.game/account/download.
You can also visit https://www.dualuniverse.game and sign in to your account via the top right-hand corner drop down menu.
Once signed in, again access the top right-hand corner drop down menu. Here you will now be given the option to 'Download The Game'.
Please note, the download option will only be available for players that subscribed via our website. Steam users need to download the client via Steam (after your purchase, the option to download will appear at the end of the process, or you can find and right-click the game in your steam library and choose 'download'). Please note: If you have linked your steam account before buying the game on steam, the game time attribution is not automatic due to unexpected technical constraints. You need to login on the website and go to your product page: https://www.dualuniverse.game/account/products.
There, you will find a button labelled "Redeem game time". Make sure you are logged on to the account you want to credit time to and press this button.