Greeting, 

during the Magento 2 Theme installation, something went wrong and I could not retrieve the site & I did not back up since it's new and has no data, so I have deleted the public_html contents and re-installed Magento 2 again and I got a successful message.

then I have installed CMSMART Online designer and tried to re-activate it by my license key but unfortunately, I got incorrect license key message !!

I want your urgent help please ....