If you want to install a package on CentOS with YUM is it possible that you might have the following error
Total download size: 20 M Installed size: 60 M Is this ok [y/d/N]: y Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. PACKAGE.x86 FAILED https://rpm.nodesource.com/pub_15.x/el/7/x86_64/PACKAGE.x86_64.rpm: [Errno 14] HTTPS Error 404 - Not Found Trying other mirror. To address this issue please refer to the below wiki article https://wiki.centos.org/yum-errors If above article doesn't help to resolve this issue please use https://bugs.centos.org/. Error downloading packages: 2:PACKAGE.x86_64: [Errno 256] No more mirrors to try.
To solve this problem we should reset the sources used by YUM, the package manager of CentOS. To do so, you should use the following command:
yum clean all
It should clean the sources of the repos. You should now be able to install the packages you want with yum i <package>