Overwriting .dat file from emClient 7 (how can I recover my mails)

I lost my HDD in Windows, I have copy of all data from emClient 7 (not backup, just file copy). After installing emClient under MAC OS I cannot merge those databases. emC is always crashing :frowning: I have a few years of history there. Please help! 

The beta versions are meant solely for testing. Please see the download page which mentions how to proceed with any issues you may have when testing beta software.