When you purchase a theme license & download the theme, you will receive a zip file.
To unzip the file on Windows right click > and choose unzip / on Mac simply double click.
Open the unzipped folder and you will find a number of folders such as Demo Content, Documentation, Licensing and one zip file which is your theme. It is important that theme zip file remain zipped.
Within your WordPress Dashboard, navigate to Appearance > Themes.
Click the "Add New" button at the top-left of the page > Click the "Upload Theme" button at the top.
Click "Choose File" > then find your theme zip file > Click the "Install Now" button.
Once the theme is successfully installed on your WordPress, you can "Activate" it via the installation page or via Appearance > Themes to switch over and begin using your new theme!
Please note: If you try installing the entire zipped theme package or another incorrect file, you'll likely receive this error message:
"The package could not be installed. The theme is missing the style.css stylesheet. Theme install failed."
If you receive this error message, please be sure that you're installing the ZIPPED file titled "wonderblog.zip".