Search for Entry ID 63472422 (or the specific update 1 delivery release) on the SIOS website.

Faster processing of external and internal tags in high-density environments.

Ensure no other Windows Updates are pending, as this can cause the Siemens installer to hang. How to Obtain and Install the Update

If you are running a redundant server setup, Update 1 includes fixes that prevent "split-brain" scenarios where servers fail to sync project data correctly.

Look at the SITRAIN or WinCC setup log files located in the C:\Program Files (x86)\Common Files\Siemens\Automation\Log folder.