From the menu using MY ACCOUNT:
- While you are logged in, click on 'MY ACCOUNT' menu at the right side of the menu bar.
- On the left side of the 'MY ACCOUNT' page you will see a vertical menu. Click on the 'Downloads' button.
- Here you can find a list of all the downloadable digital products you have purchased. Click the button with the digital product's name on the right side to download it.
From the product's page.
- While you are logged in, navigate to the acquired product's page.
- The 'ADD TO CART' button to the right of the main promo image has now became ''PURCHASED (DOWNLOAD)". Press it to download the product.

How can I install the downloaded 3D product into Daz Studio?>

First of all, open the Daz Studio and choose the base folder from the Content Library, in order to install the 3D product in that folder.
Now right click on an empty space of the container (the right space next to the folders hierarchy) of this folder and choose 'Browse to folder location' from the popup menu.
Open the folder you have saved the purchased product in another window.
Navigate into the product's zip file to enter into the 'Content' folder.
Select all subfolders and copy them or just drag them into the open window of the Content Library.
Now, you can navigate into the Content Library's pah: Runtime/Support and execute the .dsa file (or just drag it into the scene space of Daz Studio). This will (try) to update the database with the new product (Daz Studio database is a nasty thing).