You can obtain the original version of the Zad Knowledge Series (currently available in the Arabic program only) through several exclusive agents who can deliver it to you wherever you are in the world via the following link: 
The series includes 28 books divided into four levels, with each level covering seven subjects: Aqeedah, Tafsir, Hadith, Seerah, Fiqh, Tarbiyah Islamiyah, and Arabic Language. These same subjects are repeated across the four levels, with each level completing and elaborating on the material previously covered.
You can learn more about the series through the link: Zad Academy Program| Knowledge Series.
Technical Support Email: support@en.zad-academy.com - Academy Website: Zad Academy Program | Home page