If you are looking for the full course experience (A1 to A2 level), it is available at several retailers: WILLKOMMEN! 1 (THIRD EDITION) GERMAN BEGINNER'S COURSE
The PDF version of "Willkommen 1" provides an interactive and engaging learning experience. The course is divided into units, each consisting of several sections: Willkommen 1 -third Edition- German Beginner 39-s Course Pdf