SnapEDA now natively supports Diptrace on the Component Editor menu. You can follow these steps to import into Diptrace:
Import Symbols
Launch DipTrace Launcher.
Select Component Editor
From the main menu click Library and select Open
Select the .eli file downloaded from SnapEDA and click Open
Use the Select Component menu on the left pane of the window to search for the imported symbol and double-click to open.
Import Footprints
Launch DipTrace Launcher.
Select Pattern Editor.
From the main menu click Pattern and select Insert from Another Library...
In the Insert Patterns windows, click on the drop-down menu for Libraries and select Other Libraries.
Choose the library you downloaded from SnapEDA, then click on the results that show up in the Components section and click Insert to open it.