ERROR_INSTALL_ALREADY_RUNNING - 1618 (0x652)
Another installation is already in progress. Complete that installation before proceeding with this install.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_INSTALL_ALREADY_RUNNING with the numeric value of 1618 and hexadecimal representation of 0x652 indicates that an installation process is already in progress on the system. This error typically occurs when a user attempts to initiate another installation while one or more installations are still active.
Error Details
This specific error code is returned by Windows Installer (MSI) and related components during the execution of installation scripts or commands. It signifies that the installer has detected an ongoing installation, which could be due to various reasons such as a previous installation attempt that was not properly completed or terminated.
Usage Context
The context in which this error occurs is typically within the scope of software installations managed by Windows Installer. This includes both manual and automated installation processes initiated through setup programs or command-line tools like msiexec.
Developer Interpretation
When encountering this error, developers should understand that it is a generic indication that an installation process is already active on the system. The exact nature of the ongoing installation (e.g., whether it is a different installer or part of the same installer) may not be explicitly detailed by the error message itself.
Related Errors
ERROR_INSTALL_PACKAGE_OPEN_FAILED(1603, 0x647)ERROR_INSTALL_SOURCE_FILES_MISSING(1620, 0x658)ERROR_INSTALL_PACKAGE_NOT_FOUND(1622, 0x65a)
FAQ
Q: What does the error code 1618 mean?
A: The error code 1618 indicates that another installation is already in progress. Ensure that any ongoing installations are completed before attempting to start a new one.
Q: How can I resolve this issue?
A: Terminate any active installations and then retry the current installation process.
Summary
The ERROR_INSTALL_ALREADY_RUNNING error code (1618, 0x652) is a generic indication that an installation process is already in progress. Developers should ensure that no other installations are running before initiating a new one to avoid this error.