“What the security bulletin doesn’t say is that the change in Windows Installer repair operations means that application repair attempts will be met with a User Account Control credential window each time. However, the credentials required are administrator access.”
– Bug or Feature? KB2918614 Alters Windows Installer Behavior

Should your application install use Active Setup, to say, personal per-user settings, then this MS14-049 security patch causes a UAC prompt as well.

The current workaround, courtesy of happysccm,  is as follows:

1. Uninstall the application and reinstall it with the security update installed. (sourcehash file generated with security update)
2. Manually copy the sourcehash file to c:\windows\installer folder. As the sourcehash file is generated based on the application files, the sourcehash file generated on computer A can be used on computer B.

Not scalable if, say, you have 500 packaged applications deployed to customers.