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When updating software using Yum update in CentOS 7, you may encounter the following error message:

Error: Delta RPMs disabled because /usr/bin/applydeltarpm not installed.

To solve this problem, you need to install deltarpm. You can first find the package name of the package through the following command:

yum provides '*/applydeltarpm'

Then install with the following command:

yum install deltarpm