When using a YUM package manager, an upgrade from Artifactory 6.x to 7.x fails with a Nothing to do message as per below:
$ yum install jfrog-artifactory-pro-<version>
Nothing to do.
This occurs because YUM does not recognize 7.x as an upgrade over 6.x with YUM repository due to a change in architecture from "noarch" in Artifactory v6.x to "x86_64" in Artifactory v7.x.
Note: This behavior will not occur when you try to upgrade from 7.x to 7.x as the architecture is same.
As a workaround, we can download the artifact and upgrade using rpm:
rpm -Uvh jfrog-artifactory-pro-<version>.rpm
Note: yumdownloader is part of yum-utils (i.e., you may need to install yum-utils before downloading yumdownloader)