WINCC UPGRADE RT V7.X -> RT V7.4
Reference : 6AV6381-2AA07-4AX3
SIMATIC WinCC RT Upgrade from V7.X to V7.4 SP1 for SIMATIC WinCC Runtime (RT) incl. options Redundancy, Server, User Archive, Web Navigator, Web NAV Load-Balancing, Web Diagnostics Client/Server, Data Monitor, Connectivity Pack, Connectivity Station,