Best I can think is to delete all traces of EL from your computer and redownload~ If the title screen's 'Ebon Light' logo is in near black, dark purple (like above), instead of the old, lighter purple, it's the full game.
Some people thought they were still playing the demo but they were actually hitting deaths and not realizing it, in case that is at all helpful!
I hope you're able to play! <3 <3