In order to fix the issue, you will need to enable the plugin from your browser's settings. If you're using Mozilla Firefox, press the icon and click the Add-ons option. Open the Plugins tab and select Always Activate from the drop-down list next to Garmin Communicator Plugin.
If you're using Google Chrome, type chrome://plugins/ in the address bar and press Enter. After that, press the Enable button below Garmin Communicator Plugin:
In Opera, you need to type opera:config#Extensions|Plugins in the address bar and to press the Enable option next to the plugin.
If you're using Internet Explorer, launch the browser, press the Alt key and select Manage add-ons from the Tools menu. After that, click the Toolbars and Extensions option, select the Garmin Communicator Plugin and press the Enable button.