How to override Solidres's widgets in your theme
All widget layout files of Solidres plugins for WordPress are located in /wp-content/plugins/SOLIDRES_PLUGIN_NAME/templates/widgets/
So if you want to add some modification, just copy /wp-content/plugins/SOLIDRES_PLUGIN_NAME/templates/widgets/*.php flie to the wp-content/themes/THEME_NAME/solidres directory.
And change the files to your needs.
Further this way you won't lose any of your changes after an upgrade of the plugin.
Make sure to only copy the files you want to change, all other files will be loaded automatically from the system defaults.