Downgrading file during major upgrade does not install new file
Downgrading file during major upgrade does not install new file
Summary
Downgrading file during major upgrade does not install the lower versioned file
Symptoms
Downgrading file during major upgrade does not install the lower versioned file. Most of the time, both the older versioned and newer versioned files are gone from the machine after the major upgrade is completed.
Cause
This behavior is due to the installer seeing that the new file has a lower version during costing. The file is then marked as will not replace even if the higher version file is removed from the machine during the uninstall phase.
Resolution
This is the result of how Windows Installer is designed. Downgrading is not recommended.
Workaround
Mark the file as Always Overwrite in the file property.
Create an Installscript wrapper that removes the older version before installing the newer version of the installer.
