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ERROR_INSTALL_ALREADY_RUNNING
ERROR_INSTALL_ALREADY_RUNNING means that another installation is currently executing. Windows Installer serializes actions in its execute sequences, so a second install, repair, patch, or uninstall can be rejected while the first one is active.
Find the active msiexec transaction and the product it is servicing before waiting or retrying. If no visible installer UI exists, check deployment agents and service-side installations that may still hold the Windows Installer execute sequence.
How to handle it
- Wait for the active installation to finish and preserve its log before starting another MSI operation.
- Serialize deployment jobs rather than retrying several installers in parallel.
- For software that needs to detect this state, use the documented Windows Installer mutex and service-status guidance.
Microsoft: _MSIExecute Mutex · Microsoft: Windows Installer error codes
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