SiteCenter NX was released in January 2007. It is most likely the
version you have is SiteCenter NX.
Follow these steps:
1. copy all the files from your server to a backup directory
2. overwrite the files on your server with the files on this zip
3. upload the file /admin/includes/config.php from your old install
Note:
- There is no difference in the database, thus no need to transfer
your users.

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