CyanogenMod/CyanogenOS ROM is needed (ROM means system). If you don't have it, do not buy the theme.
For any problem or suggestion, send me e-mail at piereligio@gmail.com
or join my comminity and ask there https://plus.google.com/communities/108109701626930507263

Themed elements:
-AccuWeather's dark widget
-Alarm tone
-Bootanimation
-Font
-Notifications
-Ringtones
-System UI
-Wallpaper

-AOSP Keyboard
-Browser
-Calculator
-Contacts
-CyanogenMod File Manager
-CyanogenMod Gallery
-CyanogenMod Messages
-CyanogenMod Recorder
-CyanogenMod Updater
-Dialer
-Documents/Download UI
-ES File Explorer
-Google Calendar
-Google Chrome
-Google Dialer
-Google Drive
-Google Keep
-Google Keyboard
-Google Hangouts
-Google Inbox
-Google Launcher/Now
-Google Mail
-Google Messenger
-Google Play Music
-Google Play Store
-Google Plus
-Google Translate
-Instagram
-Kernel Adiutor's dark mode
-Launcher3/Trebuchet(=CM Launcher)
-Nova Launcher's searchbar
-Package Installer
-Root Explorer dark theme
-Settings
-Solid Explorer (dark theme)
-SoundRecorder
-SuperSU
-Telegram (only partially themed. For full theme use Plus Messenger, a Telegram client, and download this and apply it from personalisation settings: goo.gl/6HOQ5o )
-Theme Chooser
-Twitter Night Mode
-YouTube (settings and few icons)
-WhatsApp

Thank you all for supporting me. :)