Install Error for ES App plugin

Hi,

I was using Jomsocial + ProfileURL, but has switched to EasySocial recently. After the switch, the short-url links for the groups are not directed to the actual ES group page but to another group. I have uninstalled JS Profile URL plugin but could not install EasySocial app. The error reads:

Warning
JInstaller: :Install: Can't find Joomla XML setup file.

Error
Unable to find install package

Why am I unable to install the ES plugin/app downloaded from your site?

Thanks.