edu-clean not showing in theme list of blog

I uploaded edu-clean to a wpmu only (meaning sans buddypress) site. I went to "blogs" under my site admin menu and selected a site, then clicked on "extend." This site was not a "supporter" site and I did not make this theme available to any sites.

I checked the box to add edu-clean to the list of themes available for this blog, but when I visit the blog, it is not showing in the blog list.

What I done did wrong?

Thanking you.