This is a false-positive. Rest assured, the ESEA Client is not dangerous to your system's security, your files, or your computer as a whole, and is in no way a trojan, virus, or another form of malware/spyware.
I am unable to install the client.
You can first attempt to whitelist or add an exclusion for the client. If that does not work, you will need to fully uninstall the security programs that you have on your computer (temporarily of course). Sometimes when you add an exception for the ESEA client or have just disabled the software it can still cause an issue just from being on your computer.
As soon as you have uninstalled all of the security programs, proceed to once again uninstall the ESEA client, download and then install a fresh copy of the ESEA client with zero security software installed this time.