wget NAM_FILE
rpm -i NAM_file

==============
yum install aria2
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.de.leaseweb.net
* extras: centos.psw.net
* updates: mirror.mserverz.de
Setting up Install Process
No package aria2 available.
Nothing to do
yum update
yum list available | grep aria2