Follow the instructions below on how to install Maya into Daz Studio:
Step 1: From daz3d.com/shop/ page, type in Maya into the search bar. 
Step 2: Select the “Daz to Maya 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 Maya” 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”
Step 6: After installation has been completed, open “Daz Studio.” WIthin the top menu toolbar, “Scripts” should now be an option to select from. 
If you need further assistance on how to open your character in Maya, refer to the article, “Maya Bridge: Exporting character(s) using Daz to Maya Bridge.”