Open the Epic Games Launcher, go to the Library Tab, under vault it should have all the free stuff you downloaded, there should be an orange button next to it that says add to project, click that then choose you project to add it there
Open the Epic Games Launcher, go to the Library Tab, under vault it should have all the free stuff you downloaded, there should be an orange button next to it that says add to project, click that then choose you project to add it there