Install Error 1500 'Another installation is in progress'

Symptoms

ActivClient setup refuses to start because Windows Installer thinks another install is running.

Likely cause

Stale msiserver state.

Fix

1. Reboot and try again. 2. If still failing: Right-click This PC > Manage (as admin) > Services and Applications > Services > Windows Installer. 3. Set Startup type to Disabled. Apply. Reboot. 4. Reopen Services and set Windows Installer back to Manual. Apply. 5. Retry install.

Sourced from militarycac.com. Rewritten for clarity.

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