Error Code Portal
MicrosoftWindows Installer return codesError code

1642

ERROR_PATCH_TARGET_NOT_FOUND

Alternative forms: 0x0000066A · 0x66A · ERROR_PATCH_TARGET_NOT_FOUND · 0x8007066A

What does this code mean?

Code 1642 · An issue reported by Windows Installer return codes.

Official explanation · Original text

The installer can't install the upgrade patch because the program being upgraded may be missing or the upgrade patch updates a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch.

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