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in Data Viewer Data Source Page
1. create a page to store DataViewerDataSource -- use page item as page type, just create one web part zone and one web part of DynamicViewerSource in it

2. setting of DynamicViewerSource 
   Page type: load more repeater page type
   path: load more repeater path
   transformation: load more repeater transformation

in Load more button page 
3. create a web part of DynamicViewer
4. setting of DynamicViewer
   source: Data Viewer Data alias path
   Starting index: usually 1