When upgrading from TMWF8 to TMWF9, the upgrade crashed. This error came up.

Messaging Security Agent installation failed. Fail to Setup SQL Server 2008 R2 Express Service Pack 2 instance SCANMAIL. Refer to the setup log (%ProgramFiles%\Microsoft SQL Server@\setup Bootstrap\Log) for details.

Setup.exe has stopped working.

tmwf9

We found to continue the install we need to uninstall the old SQL instance for the TMWF8 and then it installed fine.