Yes, first you need to download package. Next unzip and upload it to your main WordPress directory (the directory where wp-admin, wp-content and wp-includes directories are).

When ready you need to instruct your server CRON to execute wphd-cron.php file every 10 minutes (or more often if you want to). Following command should do this

wget -q

Of course replace with your actual domain name. Now where to exactly enter this command depends on your server control panel, if you are unsure ask your hosting support for help.