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I'm trying to figure out if I need to upgrade to Windows Installer 4.5, but I don't know how to check the current version number.

What is the procedure to do this?

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up vote 4 down vote accepted

Run msiexec /? on the command line and it will give you the version.

Unless you've got a good reason to (read: an application requires it), I wouldn't bother personally.

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