If you are installing your theme from the WordPress theme installer, but get a message that says “Are you sure you want to do this?”, most likely your web server is configured with PHP settings that are too low to allow the theme ZIP file to upload. Specifically, PHP is configured to a maximum file upload size limit at 8 megabytes or less. Thus, the web server is rejecting the upload. WordPress is giving you a rather ambiguous message in response. This is not a theme fault or bug.
There two ways to solve this problem.
You can either get your web host to increase your PHP limits.
You can upload your theme via an FTP client. It needs to upload non-zipped theme folder into the ../wp-content/themes/ folder on your server.
Recommended PHP configuration limits are as follows:
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Clean, crisp, and well structured, the Viewport theme is perfect for the online publisher who values the use of different media. With support for images, galleries, audio and video, along with a fully responsive design.