BE SBS 12.5 to BE SBS 2012

BE 12.5 comes with bundled DLO license which cannot be uninstalled.

If want to uninstall, have to upgrade to BE 2010 R3 SP2 to uninstall.

BE 2012 doesn't have DLO and it is showing error message, while upgrading.

If I want to use the DLO, then should I install Symantec DLO 7.0 or 7.5?

Is it possible to directly upgrade from BE 12.5 DLO to Symantec DLO 7.0 or DLO 7.5 ?