Microsoft’s August 2025 security update (KB5063878) promised enhanced protection but instead unleashed a wave of unexpected challenges, particularly for non-admin users facing app installation hurdles. Triggered by a fix for the CVE-2025-50173 Windows Installer privilege escalation vulnerability, the update introduced new User Account Control (UAC) prompts that disrupt app installations and repairs, leaving users frustrated. Here’s a comprehensive guide to understanding and resolving these issues on Windows 10 and 11. What’s Causing the Problem? The August 2025 update tightened security around Windows Installer (MSI) operations to prevent unauthorized privilege escalation. As a result, standard users encounter UAC prompts requiring admin credentials in scenarios such as: Running MSI repair commands (e.g., msiexec /fu). Installing per-user configured applications, like certain Autodesk software...