If there is an update available, click Install Now and follow the prompts to complete the update.
Mac
Open Garmin Express.
Click Garmin Express in the Apple menu bar.
Click About Garmin Express.
Click Check for Updates to Express, if prompted.
Click Install Now, if prompted.
Close Other Garmin Applications
Other programs may be actively communicating with your device while it is plugged into a computer. Try closing out other Garmin applications that may be reading your device.
Run Garmin Express as an Administrator (Windows)
The error may be caused by permissions issues for Garmin Express. Running the application as an administrator may resolve this:
Locate and right-click the Garmin Express icon in one of the following locations:
Search for Garmin Express in the Start menu.
Find the desktop shortcut (if present).
Select Run as Administrator or More > Run as Administrator.
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(if present).