Theme Not Loading

I have downloaded the ColorWay theme, but when I click on the customize button to build my site, it shows that the theme is loading, but nothing happens.

I have downloaded WordPress through DomainPeople, who are already my web hosting client for an existing and still running site that was built through Dreamweaver. However, we have decided to migrate to WordPress to update the look and feel of our site. We have opted to build the WordPress site on the back-end, so as not to disrupt access to our Dreamweaver-built site, so our WordPress site is currently being built as a .php.

My first step was to download a theme. I chose to download Colorway and I uploaded Colorway through Filezilla to my FTP. However, Colorway is not loading on my site, and I’m at a loss as to how to fix it and get moving on building my new site.

Please Help!