Siemens typically distributes these updates through the portal.
Ensure no other Windows Updates are pending, as this can cause the Siemens installer to hang. How to Obtain and Install the Update wincc 7.0 sp3 update 1
Run the .exe file. The installer will automatically detect your SP3 installation and apply the patches. wincc 7.0 sp3 update 1
Faster processing of external and internal tags in high-density environments. wincc 7.0 sp3 update 1