According to the official Siemens SiePortal , WinCC Flexible 2008 SP5 Upd. 2 is only released for operating systems up to Windows 10.
Although not officially supported, some users have reported successful installations of WinCC Flexible 2008 on Windows 11 using the following workarounds:
If you are stuck with this setup, it is likely because you have a machine in the field with a dead engineering PC. The recommended path is migration: wincc flexible 2008 windows 11
According to Siemens' official documentation, WinCC Flexible 2008 is not explicitly supported on Windows 11. The software was originally designed for Windows XP, Windows Vista, and Windows 7. However, Siemens has provided some guidance on running WinCC Flexible 2008 on newer operating systems.
Siemens WinCC Flexible 2008 is a popular HMI (Human-Machine Interface) engineering software used for creating and configuring user interfaces for industrial automation systems. With the advent of Windows 11, users have been inquiring about the compatibility and installation of WinCC Flexible 2008 on this new operating system. According to the official Siemens SiePortal , WinCC
SQL Server installation errors, project opening failures due to version flags, and communication driver incompatibilities.
Unsupported. Using it on Windows 11 is at your own risk. The recommended path is migration: According to Siemens'
(Functional, but only through brute force and compatibility tricks).
In a modern OT (Operational Technology) environment mapped to IEC 62443, such a machine would be immediately quarantined. It is, effectively, a production host running with the security posture of a 2008-era PC.