Now more Pro features are available for Lite users, if they register they site and get a free license key.
To activate all features in Lite, you will need Swift Performance Extra plugin.
First Step
You need to download Swift Performance Extra plugin. You can download it from the e-mail what you get when you register your site, or from the plugin dashboard.
Second Step
Go to Plugins » Add New, then click to Upload plugin button at the top.
Then select the downloaded swift-performance-extra.zip file, and click to Install, then activate it.
Finish
That’s all! You can use all included features now.