If you still need admin rights, create a shortcut on your desktop of UE4Editor.exe from the C:\Program Files\Epic Games\4.12\Engine\Binaries\Win64\ folder and launch the engine by right-clicking on the shortcut and choose “Run as Administrator”.
You can also permanently change this by making your Windows user account an Administrator (if you own the PC you are using, colleges etc wont let you) by going to Control Panel -> User Accounts, and then selecting “Change your account type”.
btw, have fun with the OceanProject! let me know if you have any issues with it 