Hi @fitnizfury & others facing this “issue” ,
As my colleagues already mentioned you can freely ignore the activating message from inside the plugin. The version of Revolution Slider that comes bundled with X offer all the functionalities as the purchased version with the only exception you cannot import sliders straight from inside the plugin, you need to access the page https://revolution.themepunch.com/free-slider-exchange/ download the template you like and import manually by clicking import slider inside the plugin.
X purchase code won´t serve to validate Revolution Slider, if you would like to have the functionality of importing directly from inside the plugin and validating the plugin so this message disappear you need to purchase the Revolution Slider separately, the do this specifically to motivate the users to purchase the plugin, but mentioned before, beside this functionality, all the other functionalities of the plugin are 100% the same as on the version bundled with X.
On https://revolution.themepunch.com/free-slider-exchange/ when you hover each slider thumbnail you will have two icons : a link icon, and a download icon. Use the link icon to visualize the demo and the download icon on the main page : https://revolution.themepunch.com/free-slider-exchange/ to download it.
Hope it clarifies.