It works now, thnx Dijker.
the steps where:
-bring the homey in setup mode and connect to the homeySetup-xxx ssid.
-go to http://setup.athom.com, if that will not resolve, try another pc or tablet with keyboard.
-chose language
-if the message come that you should download the app press or so (tables is other key) and keep it pressed. A small text “continue in browser” come, press that.
-a message that the setup will be download should occur.
-manually connect to the normal wifi network (with working internet), then reload the browser, the message that the setup will be download should now start.
-when the download is ready, a popup occur that you should connect again to the homeySetup-xx ssid.
-after that follow the screen. In some step you should manually connect to the normal ssid.