Because I find the map material in the Navi quite old, I would like to check if an update is available. I should install the mini update manager via Ministore for Win. It lands a file with the extension crdownload at the downloads. With Google Chrome I just can’t get this file open. On the Internet at least 10 experts give an answer: all answers do not help. What can I do? How can I get an update? (The update must be copied to USB Stick and then be installed in the car. )