Solution : https://service.sap.com/sap/support/notes/549281 (SAP Service marketplace login required)
Key words : 
0 sp07 dataloader delta download reason, prerequisites null pointer exception, symptom delta download, delta download solution, initial downloadis finished, automatically restart, terms ipc 3, patch version, note 486061
Related Notes : 
       
| 486061 | How to get patches for CRM Internet Pricing Configurator |