OS: CentOS release 4.6 (Final)
I am trying to install the latest emacs which is listed on their website as being v24.3. However, when I try to install with YUM the version is 21.3-19 which is from 10 years ago. What do I need to do?
You use old OS (CentOS) and emacs-21.3-19 is the latest version that exists in CentOS 4.6 repositories. Try to find more fresh version here, or another custom repository, or compile latest emacs version from sources.