Changed server Rapidweaver still trying to link to old server

If you can get the project opened Okay (Project file on the local HD (documents synced to iCloud).
Running RW8 Under Advanced set Site Resources to Copy into document
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Then when you save the project all the resources will be copied into the project file.

In earlier releases, the option was a button that toggled called something like make portable or Unpack Portable Document depending on how the option was set.