If you are using Garmin Express then I suggest you use the 'Copy to Computer only' option, this will download the files to a folder on your computer, when download is finished run Garmin Basecamp, this should find the new maps on your computer and allow you to use the Map Install option in Basecamp, this has several advantages, it means you don't get a failed download (which can take several hours to repeat), it also allows much more control over the download to satnav procedure because you can see how much space is available and also specify where the map is installed to I.e., send it to internal or microSD memory