Error 505 during installation from Play Store
Try to download and install from http://www.apkmirror.com/apk/google-inc/google-play-games/google-play-games-3-7-23-release/google-play-games-3-7-23-2867637-836-android-apk-download/download/

It worked out for me on slimrom for Kindle Fire 5th gen