WinCC 7.5 SP2 requires a specific version of SQL Server, which is typically included in the installation package.
For detailed technical manuals and release notes, you can refer to the Siemens Industry Online Support (SIOS) portal. 5 SP2 server or client installation? WinCC V7.5 SP2 Architectures - Siemens wincc 7.5 sp2 compatibility list
Do not manually upgrade the SQL instance; use Siemens-provided updates only. Virtualization and Hardware Virtualization Platforms VMware vSphere Hypervisor (ESXi): 6.5, 6.7, 7.0. Microsoft Hyper-V: Based on the supported OS. Minimum Hardware Specs CPU: Multi-core, 2.5 GHz or higher. RAM: 8 GB (16 GB recommended for Server/Engineering). WinCC 7
Engineering & runtime components
WinCC uses for archiving and licensing.