X4D Core is a LibStub-compatible library of shared code used between multiple X4D Addons. Rather than duplicate this code it has been consolidated into a separate library add-on.
This library is required to install and use any X4D Addons.
If you’re not using a download manager, you may want to download the X4D ESO All-In-One release instead, it contains all necessary files and dependencies ready to be copied into your addons folder.
As with most Addons, simply open the Archive and copy the contents into “%USERPROFILE%\Documents\Elder Scrolls Online\live\Addons\” folder.
If ESO is already running, execute /reloadui command.