You must have modified template files in the plugin -in that case it will allways be overwritten. The best way to do it is to copy all the files from the template folder of the plugin into the theme folder that you are using . Any plugin update will not make changes to those files.
How to Get Support
After you register and login to the site, you may post all plugin support questions in the Support Forum.
If you need to provide private info, please create a ticket and then reply to it using Set as private reply option.