Do you mean once you installed the theme it loaded with those “Hacked By” data? If so, you should contact Envato Help Centre immediately and ask them to check this item.
But if your site is hacked after theme installation, you should contact your hosting company and ask them to do a security audit on your site/server and check for backups…
I hope that helps.
Duplicate Thread: http://themeforest.net/forums/thread/how-partnership-work-in-tf/164569
It seems you are trying to install the main package instead of “Theme Only” package. Please go to your download page here:http://themeforest.net/downloads
Then beside this item, click on “Download” button and then choose “Installable WordPress file only” and install it.
Please also note that you should purchase this item again if you are trying to install it on a new site