Google removed the ability to use a "saved locations" within Google Maps. Google changed how that worked a while back and gave people a way to download their locations. The way to download saved locations has now changed.
In an updated Google Maps Help thread, Cecelia from the Google Maps team wrote:
I want to update the link for downloading your Saved Locations to a KML. Please use the link below.
If you want to download those saved locations to a KML file which can open them up in Google Earth, then use that link.
Forum discussion at Google Maps Help.
