Theme is Missing the style.css Stylesheet
When your trying to install a theme on WordPress for the first time, you may experience an error message stating:
“The package could not be installed. The theme is missing the style.css stylesheet. Theme install failed.”
Don’t worry! This is quite a common mistake cause by the uploading of the wrong file
When you purchase a theme & download the theme package, you will receive a zipped folder .
Unzip this first theme package folder.
Within the unzipped theme package, you will find a number of folders such as Demo Import Files, Guides, etc. And also a zipped file called “tuulikki-v100.zip” (Where number 100 is the current version number, so by the time your reading this the number could be higher due to a more recent version).
This file is the main theme and it’s the file you need to install onto WordPress.