Once you're pleased with the plugin and would like to proceed with the regular license, it's a matter of ordering a paid license and applying the new license key via WHM (no reinstall is required).
1) Order a new license via this link:https://www.unixy.net/secure/cart.php?a=add&pid=220
2) Once we process the order, the paid license key will be posted in the Products & Details section in the Client Area
3) Copy & paste the license key and apply it via WHM -> cPanel Varnish -> Update License