activated theme cannt be display at front side.

Hello all,

Real estate theme which is premium theme that client can purchase from templatic site, I have download this theme from my clients ftp which is available at wp-content/theme folder.
And put this theme in my default wordpress site.
than I have activate it from appearance->theme at dashboard.
But now the problem is that, as I have activate it, I could not see at front side and got the error like,
“The connection was reset.
The connection to the server was reset while the page was loading.”
Any help please.