Theme install error on Network Solutions

Unzip the file on your desktop. check if there is a style.css template in it.

If all files there, try a manual installing this theme following these instructions: https://codex.wordpress.org/Using_Themes#Adding_New_Themes_by_using_cPanel
or
https://codex.wordpress.org/Using_Themes#Adding_New_Themes_Manually_.28FTP.29

the theme I bought came in a zip file.

If the above suggestions don’t help, then you’ll be more likely to find a good answer from your theme’s developers, for they have the access to its code. http://codex.wordpress.org/Forum_Welcome#Commercial_Products