[PROJECT_NAME]/Pluginsfolder. If there is no
Pluginsfolder you will need to add it yourself. Then unzip the ReadyPlayerMe Unreal Plugin zip inside there and you should see two new folders: ReadyPlayerMe and glTFRuntime.
Program Files/Epic Games/[ENGINE_NUMBER]/Engine/Plugins. Once there unzip the Ready Player Me plugin zip and you should see two new folders: ReadyPlayerMe and glTFRuntime.
Edit > Plugins. You should see the ReadyPlayerMe and glTFRuntime plugins in there. Now tick the Enabled option for both and now the plugins are ready to use.
.zipfile, if you are using an older or newer version of these dependencies please backup your project before making changes.