First of all - Thank you for your answer! You might have recognized from my writing, that English is not my native language. I should have stated before, that I'm new to Raspberry in general. So please forgive, if I misunderstood someting wrong. In fact that was basically it. As from your original p...

I'm using a Raspberry Zero W to convert the Image for a Raspberry Pi 3B+. My problem is that I depend on a program written by a company that seems not willing to update their program for current OS (Stretch). The programs runs on the older Jessie Lite. if I update to Stretch the program does not run...