Hi angelicpyro143,
If you’ve gotten to the Epic Games git, ensure the branch (located under the pink bar) is either release or 4.7 and then download the zip. Once that is done on that same git webpage if you scroll down are the instructions to build the engine and launch it in debug if you choose. You can also navigate to your download and go into the binaries folder to find the editor.exe, and launch. Once launched create your project and in editor go to window>plugins>devices and click the enabled box for the leap motion controller plugin! Hope this helps.