Error Code Portal
MicrosoftWindows Installer return codesError code

1605

ERROR_UNKNOWN_PRODUCT

Alternative forms: 0x00000645 · 0x645 · ERROR_UNKNOWN_PRODUCT · 0x80070645

What does this code mean?

Code 1605 · An issue reported by Windows Installer return codes.

Official explanation · Original text

This action is only valid for products that are currently installed.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

MsiExec.exe and InstMsi.exe error messages (for developers) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices