The minimal requirements for R2H PageRefresh are;
Install the PageRefresh plugin like all other Joomla! software. Download the plugin, named plg_system_r2hrefresh-<version>.zip and drag & drop it to the installer of your Joomla! website.
Updating PageRefresh is easy! Simply follow the instructions above with a newer package file or use the Joomla! updater to install the latest version.
If you need to uninstall PageRefresh, follow the instructions below.