The 'Software' option is only used to upgrade the ClearNav to a new release. This option is only available if ClearNav application files(CN.exe and CN.nks) are placed on the USB Memory stick or SD Card.
The default option is "Don't Update Now". Hit the controller select button to accept this option.
"Select All" will check all the options - and automatically highlight the "Update" command box to initiate the update. (You can up arrow and deselect/select options.)
Individually select or deselect each option: Languages, Map Data, Waypoints, Airspace - then highlight and select the "Update" command to initiate the update.
'Software' will update your device using the CN.exe and CN.nks files.
The other options will copy the appropriative files from the USB /SD device to solid state storage on the CN unit. These files then have to be loaded using a setup menu function.