Even if Essential Forms is not open at the computer where the update is running, the installation program is able to detect if any Essential Forms user on the network currently has Essential Forms shared data files open. Make sure all network users have the program closed before running an Essential Forms update. If the message persists even after all users have closed the program, the computer where your Essential Forms shared data folder is located may need to be rebooted to force it to release any locked shared data files.