billt304
If you read Norbert's manual carefully you will find the instructions relating to Project Folders on Page (Seite) 8.
Basically, you need to make a new folder for each route.
Give the folder the same name as you planned route and, inside the folder, make three further folders called "dem", "karten" and "details". That should get you going.
I spent quite a long time struggling with MapMaker before I realised that it works very well but only you follow the instructions to the letter.
Hope this helps,
Chris