If your ESEA Client is unable to successfully update it is likely being blocked by other software on your computer. Recently, we have identified Bitdefender most often causing this behaviour. To remedy this, we recommend simply uninstalling Bitdefender and then restarting your PC before installing the ESEA Client again. It may be sufficient to simply disable Bitdefender or add the ESEA Client and the ESEA Client installer as an exception in the software.
If the issue persists, please submit a ticket here so that our staff can work with you to diagnose the issue and try to identify a solution for you.