Windows error 1621 (ERROR_INSTALL_UI

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Windows Installer user-interface handler could not be initialized.

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ERROR_INSTALL_PACKAGE_INVALID	ERROR_INSTALL_LOG_FAILURE

ERROR_INSTALL_UI_FAILURE

ERROR_INSTALL_UI_FAILURE means that Windows Installer could not start the user-interface handler required for the operation. It is distinct from an installation action failure: the installer could not establish the intended UI path.

What to check

Record whether the install is interactive, silent, or uses an external UI handler supplied by another process.
Check the requested UI level and the account or session in which the command runs.
Enable logging and capture the exact command line before changing package content or custom actions.

Microsoft: Windows Installer error codes · Microsoft: Installer function reference

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