I unzipped my theme, set the permissions:
find . -type d -exec chmod 755 {} \;
find . -type f -exec chmod 644 {} \;
And when I get into the administration page and go to view the site I get this:
Unable to create default directory (/var/www/mydomain.com/templates/rt_cerulean/css-compiled) for compiled less files. Please check your filesystem permissions.