If you get the “Are You Sure You Want To Do This” message when installing the theme’s zip file via WordPress, it means you have a low upload file size limit.
Install the theme via FTP if this happens, or call your hosting company and ask them to increase the limit. We recommend the later.
If you want to upload the theme via FTP please log into your hosting space via an FTP software
Unzip the miami.zip file and ONLY use the extracted Miami theme folder
Upload the extracted Miami theme folder into wp-content > themes folder
Activate the newly installed theme. Go to Appearance > Themes and activate it.