I am also in need of the 2008 Pro version!  I have tried several versions of the software but I am unable to restore the back up copy I have of 2008.  I tried 2010, 2013, 2016 and 2019!  I have also tried File Doctor to repair the file but it tells me my password is incorrect but I know it is not.  Any suggestions?

Once I get the file restored, I plan to bring up to a current version but without a successful restoration on any version of QBDT, I am at a loss.