Hueber has made minor updates, but the core exercises rarely change. Check the copyright page. If your ISBN ends in -902-8 (for the Kursbuch), solutions from the corresponding Lehrerhandbuch (ISBN ending in -902-8 as well) are safe.
A word of caution: Many websites offer free PDFs of answer keys, but they often violate copyright laws. Hueber invests significant resources into developing high-quality materials, and piracy harms the educational ecosystem. Below are ways to obtain the solutions. menschen a2 1 kursbuch loesungen