The ability to install maps to the computer using Garmin Express 4.x has changed slightly.
The option to install maps to the computer when performing a reinstall is not being offered at this time if the full coverage of mapping had previously been installed to the GPS device or a SD card. A request has been made to add this functionality back to Garmin Express but until then, if maps must be installed to the computer and this is not a first time update, ie a reinstall, an earlier version of Garmin Express (3.2.x) will need to be installed on the computer to do so.
However, if you are installing the map for the first time, you can click “View Details” for the map update and select the option to install maps to the computer.
If you previously installed a smaller region and would like to install maps to the computer, this can be done by selecting “Change Map” and then going into the change region selection and choosing “use map with Garmin BaseCamp.”