To install the plugin, nothing simpler: unzip the latest version, put the folder wp-ptviewer inside your WordPress wp_content/plugins folder. Finally, activate the plugin using your WordPress administration interface.

If you are upgrading from a previous version of WP PTViewer (1.x), you first need to deactivate the old version, delete the wp-ptviewer folder existing in your plugins directory. Then you can install the new version following the above procedure.