The way Fedora does automatic software updates has changed with the replacement of yum(8) with dnf(8).
Start by disabling yum's automatic updates, if installed:
# dnf remove yum-cron yum-cron-daily
Then install the dnf automatic update software:
# dnf install dnf-automatic
Alter /etc/dnf/automatic.conf to change the "apply_updates" line:
apply_updates = yes
Instruct systemd to run the updates periodically:
# systemctl enable dnf-automatic.timer # systemctl start dnf-automatic.timer
Good
Date: 2015-08-21 09:30 (UTC)downloadfreely
Date: 2015-10-24 12:40 (UTC)