The plugin can be installed entirely from WP Admin or Manually, similar to any other plugin.
From WP Admin:
1. Go to WP Admin – Plugins – Add New
2. Search for “mplus-toolbox“
3. Install the one from 79mplus, then Activate it
1. Download the plugin zip file from here
2. Extract it
3. Upload the plugin directory on wp-content/plugins
4. Activate Toolbox for Dokan plugin from WP Admin – Plugins
Please note that you would also need to configure it in order for the plugin to work.