Microsoft points out a side effect of the August updates. User account control prompts appear when MSI repairs are started.

Keeping your Windows system secure is vital for the operating system on your PC, and it takes some time and diligence.

Microsoft has fixed a known issue caused by the August 2025 security updates, which triggers unexpected User Account Control ...

Microsoft says the August 2025 security updates are triggering unexpected User Account Control (UAC) prompts and app installation issues for non-admin users across all supported Windows versions.