RedHat is a commercial linux, you need to purchase it through www.redhat.com
Fedora is a "free" version of RedHat but is generally not as stable/enterprise ready.
CentOS is a linux built from the source RPMs of Redhat so is generally compatible with RedHat systems.
Neither of the above come with OTRS ready to run.
Shawn answered in a previous thread to try turnkey linux or jumpbox.com - but neither of those are free either. If you want it for free you have to build it yourself.
Steve
Dear
where I can download the ISO for RetHat OTRS, or where I can see a guide on how to install OS
regards
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