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When using CentOS 7.5 to install software, there is an error prompt

[root@instance-lzteipxa ~]# yum update
Loaded plugins: langpacks, versionlock
baidu-bcm                                                | 1.2 kB     00:00
base                                                     | 3.6 kB     00:00
epel                                                     | 3.2 kB     00:00
extras                                                   | 3.4 kB     00:00
nginx                                                    | 2.9 kB     00:00
rpmfusion-free-updates                                   | 3.0 kB     00:00
rpmfusion-nonfree-updates                                | 3.0 kB     00:00
updates                                                  | 3.4 kB     00:00
(1/3): epel/x86_64/updateinfo                              | 948 kB   00:00
(2/3): epel/x86_64/primary                                 | 3.6 MB   00:00
(3/3): nginx/x86_64/primary_db                             |  35 kB   00:01
epel                                                                12703/12703
Resolving Dependencies
--> Running transaction check
---> Package nginx.x86_64 1:1.12.2-2.el7 will be updated
---> Package nginx.x86_64 1:1.14.0-1.el7_4.ngx will be an update
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package       Arch           Version                       Repository     Size
================================================================================
Updating:
 nginx         x86_64         1:1.14.0-1.el7_4.ngx          nginx         750 k

Transaction Summary
================================================================================
Upgrade  1 Package

Total download size: 750 k
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
nginx-1.14.0-1.el7_4.ngx.x86_64.rpm                        | 750 kB   00:02
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Updating   : 1:nginx-1.14.0-1.el7_4.ngx.x86_64                            1/2
warning: /etc/nginx/nginx.conf created as /etc/nginx/nginx.conf.rpmnew
  Cleanup    : 1:nginx-1.12.2-2.el7.x86_64                                  2/2
  Verifying  : 1:nginx-1.14.0-1.el7_4.ngx.x86_64                            1/2
  Verifying  : 1:nginx-1.12.2-2.el7.x86_64                                  2/2

Updated:
  nginx.x86_64 1:1.14.0-1.el7_4.ngx

Complete!
[root@instance-lzteipxa ~]# systemctl restart nginx

Incremental RPM packages contain differences between old and new versions of RPM packages. Applying incremental RPMs to old RPMs will result in new RPMs. A copy of the old rpm is not required because incremental RPMs can work with installed RPMs. The incremental RPM packet size is even smaller than the patch rpm, which facilitates the transmission of update packets over the Internet. The disadvantage is that update operations involving incremental RPMs take much longer CPU cycles than those using pure RPMs or patch RPMs

Solutions

yum provides '*/applydeltarpm'
yum install deltarpm