Loads of posts in this forum regarding trying to play the game from different launchers. Generally, you need to uninstall the game and ALL launchers, then reinstall the launcher for the company where you got the version you want to play. If this doesn't work, you need to contact tech support for that company. As it sounds like you want to play the EA version, you would contact EA support directly.
Feel free to search this forum for "epic", as well. Like I said, loads of existing posts, some of which may help, if above doesn't work out for you.
