Hello!
My name is Nick and I will be happy to assist. Im a certified Linux System Administrator, I have solid experience with yum. Please keep in mind your CentOS version has been already declared EOL so I assume you are already using a 3th party repo because official repository for your CentOS version is already outdated. Anyhow, I will need to take a look at what yum shows after running the install command.
If you check my freelancer customer reviews you will see Im one of the most rated sysadmin for this type of job.
Please find me available in chat to further discuss about this job.
I look forward to hear from you soon.
Regards,
Nick.