Install via the admin:
Unzip the downloaded file and Find the zip file “upload-themename.zip” inside the unzipped theme you have download.
- In your store admin, click on the gears icon on the top right of your screen.
- Click on “appearance”, then click on “themes”
- Then click on the green plus button at the top right. (see below)
Upload the zip file you have downloaded. Now the theme is installed.
Now you just have to set the theme as default by hovering over the theme icon and clicking “set default”.