Follow these steps to import symbols and footprints into DipTrace:
Open the DipTrace Launcher.
Select Component Editor.
Go to Library > Library Setup
On the Library Setup window, click Add and name it SnapEDA Library, make sure the Components and Patterns option is marked, and click OK.
Click on the arrow next to Components and select the SnapEDA Library you just created.
Right click on the space under SnapEDA Library and select Add Library to “SnapEDA Library”
Click Add from File, select … and find the .eli file you downloaded from SnapEDA, choose OK.
The symbol and footprint will now appear under the SnapEDA Library on the Schematic Capture and PCB Layout.