Okay
  Print

how can I fix this "theme is missing the style.css stylesheet" error?

Did you get this error:

Unpacking the package…

Installing the theme…

The package could not be installed. The theme is missing the style.css stylesheet.

Theme install failed.

------------------------------------------------------------------------------------------------------------------------------------

Solution:

- You installed whole downloaded package, you should install Installable WordPress File not whole package that you downloaded from ThemeForest.

You can download the Installable WordPress file via ThemeForest Or you can find the zip file included in downloaded package in Theme or Upload Theme Folder inside the zip file.