Get an access to all 265 items designed and developed by LTheme team plus all the future items which will be released over the course of your club subscription. Price starting from $69.00
Installing the theme…
The package could not be installed. The theme is missing the style.css stylesheet.
Theme install failed.
Cheers
Jim
Did you read the document in download package?
You can read online document at http://ltheme.com/lt-storage-wordpress-theme-document/
I think you just forgot to unzip package before to install.