If you need to open an old project once a year to patch a line of code, the hassle of forcing it onto Windows 11 (using SP4 and Compatibility Mode) is acceptable. However, for new projects or daily engineering work, the industry standard has moved to TIA Portal. Do not build new systems on this legacy platform; you are inviting a cybersecurity and compatibility nightmare.
According to the official Siemens SiePortal , WinCC Flexible 2008 SP5 Upd. 2 is only released for operating systems up to Windows 10. wincc flexible 2008 windows 11
Although not officially supported, some users have reported successful installations of WinCC Flexible 2008 on Windows 11 using the following workarounds: If you need to open an old project
The phrase "WinCC flexible 2008 on Windows 11" is enough to make any seasoned automation engineer wince. WinCC flexible 2008 is a legacy SCADA/HMI engineering software from Siemens, released during the Windows XP/Vista era. Windows 11, conversely, represents the cutting edge of Microsoft’s operating system architecture. According to the official Siemens SiePortal , WinCC
Siemens has effectively declared WinCC flexible 2008 as "End of Life." They do not support it on Windows 10 or 11.
Note: Siemens has officially declared WinCC Flexible 2008 as discontinued. For new HMI development on Windows 11, the supported product is TIA Portal WinCC V17 or higher.