Network error on custom template installation

To whom this may concnern,

I recently bought the Jupiter template from themeforest followed the installation instructions, and attempted to import the xml file. When I hit upload file and import everything seems fine, but when I get to the assing authors page, and try to import attchments, I get the following error

Network Error (tp_error)

A communication error occurred: “Operation timed out”
The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.

For assistance, contact your network support team.

Please help!!