FOR 32-bit x86
Install adobe noarch and import it.
rpm -ivh http://linuxdownload.adobe.com/adobe-release/adobe-release-i386-1.0-1.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux
FOR 64-bit x86_64
Install adobe noarch and import it.
rpm -ivh http://linuxdownload.adobe.com/adobe-release/adobe-release-x86_64-1.0-1.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux
Now check for update.
yum check-update
Now install flash plugin and supported libraries using yum.
yum install flash-plugin nspluginwrapper alsa-plugins-pulseaudio libcurl