You can use WordPress uploader to install the theme. Navigate to Appearance ▸ Themes ▸ Add New ▸ Upload Theme. Find and select "wakiro_v.X.X.zip". Hit "Install Now" and the theme will be uploaded and installed. Once the theme is uploaded, you need to activate it.
It's highly recommended to install and activate child theme as well. After parent theme installation, find "wakiro-child-theme.zip", install and activate it. Do it before you perform importing demo content, because WordPress Customizer does reset to default settings every time you switch between themes.