i try to install lightroom 5.6 and receive Exit Code: 7 ERROR: Third party payload installer Adobe_Lightroom_x64.msi failed with exit code: 1603

Same problem. I have CC installed on Win 7 with all other apps working fine. Tried to install Lightroom 5 and got:

Exit Code: 7

Please see specific errors below for troubleshooting. For example,  ERROR:

- 0 fatal error(s), 3 error(s)

----------- Payload: Adobe Photoshop Lightroom 5 5.7.0.0 Adobe_Lightroom_x64.msi_5.7 -----------

ERROR: Error 1935.An error occurred during the installation of assembly component {5C21D397-1DA5-

3749-8C1F-165F21DE9E3E}. HRESULT: 0x80070003.

ERROR: Install MSI payload failed with error: 1603 - Fatal error during installation.

MSI Error message: Error 1935.An error occurred during the installation of assembly component

{5C21D397-1DA5-3749-8C1F-165F21DE9E3E}. HRESULT: 0x80070003.

ERROR: Third party payload installer Adobe_Lightroom_x64.msi failed with exit code: 1603

I uninstalled all Adobe CC software, ran Adobe CC Cleaner, cleaned my Registry using Piriform CCleaner 5, rebooted and reinstalled CC from scratch. Same problem--everything else installed correctly except Lightroom 5. Also tried uninstalling KB2918614--no joy.

Dayton

It seems that a Windows Security Update is reason for that failure. Deinstall KB2918614 for solving the problem.

Sallwitz please see Error 1603: A fatal error occurred during installation for information on how to resolve error 1603.