In the past there was always a windows installation file in the request of the generic routable. Now its no more present.
Is this a fault on the site or is there a new way to download this file ?
Please read the FAQ. If the file size is larger than 2gb, there was never a windows installer.
Better go for the gmap (“Mac”) versions. They dont need an installer and works under Windows as well.
(for the benefit of anyone else looking at this) this appears to be about downloads from http://garmin.openstreetmap.nl/ rather than anything from https://www.openstreetmap.org/ .