It doesn't work. I have uninstalled Embird and Thumbnailer, uninstalled the Explorer plug in and re-installed it (rebooting the system after each operation). Any idea on how to get the plugin to work?
For this operation, I recommend checking the official support page provided by the developers of the application. Click the FAQ page corresponding to the version of the software installed on your computer and then you should be able to install it. Additionally, read the help file for the plug-in. Most plug-ins are delivered in ZIP format. In archive you will find a license file and a readme file that explain how to install the plug-in.
Official support page: http://www.6dembroiderysystem.com/en/Support/Software-Help