As I don't know exactly what you have done so far, make sure you completely uninstall your previous installation, and delete the install folder.
C:\Program Files (x86)\EA GAMES\Earth & Beyond
Then run Unified Installer.
It will ask for eandb_demo.exe path.
Then it will ask if you want to patch. Say yes.
Just follow what it asks.
When complete, set LaunchNet7.exe and enb.exe, and enbconfig.exe to run as Administrator.