Enabling Windows Installer verbose logging via registry

Recently , I had sever instances were we needed a installer log for change mode for FIM. I had the details but my colleague Peter documented this quite we for us:

https://identityunderground.wordpress.com/2014/02/05/note-to-self-enabling-windows-installer-verbose-logging-via-registry-while-troubleshooting-fim2010-hotfix-installation-fail/

Thanks Peter