After installing Pro Tools 5.1, my surround mixer is not installed and...

After installing Pro Tools 5.1, my surround mixer is not installed and I have no options for surround mixing.

Stereo monitoring mode was chosen during Pro Tools installation.Either reinstall Pro Tools and choose either of the two Surround monitoring mode choices (Film or DTS), or copy the Surround Mixer plug-in from the Pro Tools 5.1 CD-ROM to your Plug-Ins folder (System Folder / DAE / Plug-Ins)

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