On the External References palette, make sure all references are displayed by switching the Missing toggle off.
In the File References pane, right-click the external reference file with a status of Not Found and choose Select New Path.
Note: It is recommended that for a single selected broken reference, use the Select New Path option.
In the Select New Path dialog, browse to and select the new path for the missing reference file. Click Open.
The path of the missing reference is updated and the file is loaded.
In the External References - Apply Path message box, click Yes to apply the same path to other missing references found in the new path or click No to not update the paths of other missing references.