Follow the instructions below on how to install Unreal into Daz Studio:
Step 1: From daz3d.com/shop/ page, type in Unreal into the search bar. 
Step 2: Select the “Daz to Unreal Bridge” product and place it into your cart and proceed to checkout.
Step 3: Once your item has been purchased a confirmation page will appear with your order number attached. 
Step 4: Open Daz Central and select “Daz to Unreal” from the left side navigation under “Bridges.”
**Additional Details:
If you already had Daz Central open, select the “Refresh” icon in the upper right hand corner. A new section called “Bridges” will appear in the left side navigation.
Step 5: Select “Install” A pop up box will appear to select the path for the Daz to Unreal installation. 
Step 6: The Unreal Engine version will be auto filled with the most recent version to install. Click on the “Select Path” button and link it to the same location where the Unreal program has been saved to.
If you need further assistance on how to open your character in Unreal, refer to the article, "Unreal Bridge: How to use the Unreal Bridge."