The official publisher's website for the Studio d series. While they often require a login, they provide the most accurate digital supplements.
Private users often upload specific exercise answers (not the whole PDF) to Quizlet or in closed Facebook groups like "German Learning Studio D." Search for "Studio D A2 Sprachtraining Unit 4 Lösungen" to find crowdsourced answers for specific problematic exercises. Studio D A2 Sprachtraining Answers Pdf
You can find the "Sprachtraining" solutions on several popular study sites: : Multiple versions of the Studio d A2 Sprachtraining solutions The official publisher's website for the Studio d series