One update refused to install properly... Garmin Express ran without errors, but when Garmin Express checked for updates, the same update was listed as ready to install.
Windows 7 computer reported that the Garmin had 1.7GB space available, which seemed to be enough for a minor update.
Resolved by inserting a blank micro SD card (mine was 32GB, smaller capacity should work). Ran update again and it installed properly, Garmin Express now reports "You're up to date!".
B. Jones
Garmin Zumo 595