Hello,
Please try:
# yum clean all
and retry.
If it still does not work, it might be that the CDN edge you are hitting is not yet fully updated. In which case, try changing:
installrepo.kaltura.org
into:
installrepo.origin.kaltura.org
in /etc/yum.repos.d/kaltura.repo
make sure to change it back afterwards since, ideally, it is better to use the CDN as it's faster.