The upgrade can be purchased to bring up-to-date an
older version of the same product type (Developer/Author/Editor), edition
(Professional/Enterprise) and license model (user-based/floating).
product version is considered to be eligible for upgrade until it has reached the
End of Support milestone according to End of Life
Policy and 12 months after. Customers wishing to upgrade from a non
eligible version to the latest version will need to purchase a new product license.