How to import Desktop Central 7 backup to new version 8

How to import Desktop Central 7 backup to new version 8

I am upgrading Desktop Central 7 to 8. 
But after new installation of Desktop Central 8. 
I am Getting Error when trying to restore backup in desktop Central 8
 
Error :  "Invalid backup format"
 
If you have any suggestion please let me know.
 

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