It's been fixed, thank you for the report, to update just the skin, please run:
Code:
cd /usr/local/directadmin/data/skins
mkdir -p evolution
cd evolution
wget -O evolution.tar.gz https://demo.directadmin.com/download/evolution.tar.gz
tar xvzf evolution.tar.gz
cd ..
chown -R diradmin:diradmin evolution