We are quite sure that CityUp GmbH ‘s business is not so good that they can afford their advertisers (and screen tenants) to have windows dialog boxes pop up on their screens all over the place.
Last week in the fair city of Düsseldorf  we were (a) impressed by how many shops and hairdressers had CityUp screens in them but were also (b) disappointed at the numbers that had these Windoze dialog errors on them.
This is pretty basic stuff that ought to be fixed.
CityUp fund the screens and find tolerant high street store owners to take them and put them in the window free of charge. CityUp sell advertising on the screens. The high street owner receives time on the screen for their own use.