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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.
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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