User Account Control (UAC) or Windows blocks a setup file Rumi, May 2, 2026 When User Account Control (UAC) or Windows blocks a setup file like k3_pki_setup.exe, it is usually because the digital signature is missing, invalid, or deemed unsafe by Windows security policies, the solution that worked for me- Disable Admin Approval Mode (Advanced) If you are still blocked, Windows might be enforcing… Continue Reading