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0x00000666

ERROR_PRODUCT_VERSION

Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.

win32decimal 1638Windows Installer (MSI)

Matched as: the code as given (hex)

Log a case with no specific solution
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Source: System Error Codes (1300-1699) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09