Download and install the (this installs older DirectX 9.0c files required by FIFA 14).
Look at the Protection History or Quarantine zone. how to fix core activationdll in fifa 14 install
The in FIFA 14 occurs because your antivirus software or Windows Defender mistakenly flags and deletes this file, or the file becomes corrupted during installation. Because this file acts as a security handshake between the game engine and your operating system, its absence completely blocks the game from launching. Download and install the (this installs older DirectX 9
The Core/Activation.dll error is one of the most common issues encountered when trying to install or launch FIFA 14 on modern Windows operating systems. This error typically manifests as a popup stating that the file is missing, corrupted, or that the application failed to start because Activation.dll was not found. Because this file acts as a security handshake