A direct upgrade is when the new software will be installed on the same physical server and the same virtual server where
the currently installed version is running. Direct upgrades allow you to upgrade from your current release to the latest release
without the need to upgrade to an intermediate software version. It is a single upgrade rather than a multi-hop upgrade.
There are two types of direct upgrade:
Standard upgrades are upgrades that do not require upgrades to the embedded operating system. You can install upgrade software
on your server while the system continues to operate.
Refresh upgrades are required in situations where incompatibilities exist between the old and new software releases. For
example, a refresh upgrade is required when the major version of the embedded operating system changes between the version
you are upgrading from and the version that you are upgrading to.
The application automatically determines whether you need to perform a standard upgrade or a refresh upgrade.