You can use this version for evaluation and educational purposes, and for component development as well*.
If you want to use it in any other way, you need to upgrade to the commercial version.
There’s no missing functionality, just watermarks here and there. ^^
* Component developers could easily export their components as extensions (created with both free and the full version) as Unity package, without the need of incorporating the eDriven.Gui package inside.
eDriven.Gui is built on top of eDriven core.
eDriven framework is an asynchronous, event-driven framework for Unity3d.