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Upgrading Standard to Ultimate - how I did it.,
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This review is from: Fallout: New Vegas - Ultimate Edition (PC DVD) (DVD-ROM)
I won't review the game as we've already had people do that but this is a note for all those us who've already got the standard version when it was originally released and bought this for the added missions.
When installing this from the disk, it can cause a conflict with the original version in Steam, various reports on the net including on the Steam forum, where it will either say you've already got this product or will always launch the original. One of the ways to fix this is to contact Steam support and get them to remove the original code from your account.
To avoid having to do this don't install from the disc, just activate the code in the box in steam and it will convert your existing standard installation into the Ultimate and download the additional content.
When starting Fallout NV you need to turn on the new added content in the 'Data File' section of the client loader, they will then appear in game next time you start playing.