Grab the Easy Transition Lite mogrt you just installed in the library and drag it on the Premiere Pro timeline above the two footage clips you want to transition between.
Your mogrt is now inside the Premiere Pro Essential Graphics library. Navigate to the mogrt file you downloaded, and select it. In the bottom-right corner of the Essential Graphics panel, hit the Import button.
You can find it under Window > Essential Graphics. Inside of Adobe Premiere Pro CC, open the Essential Graphics panel.