There is a special price for upgrading to the current version. But this is only valid for very short time! There has been a lot of confusion among users recently about Hauptwerk and MDA, but the new version seems to be working properly so far.
Update:
The validity of the upgrade price for owners of HW version 4.2 Advanced has just been extended to jan. 6 2020.
Missing coupons are now being sent out.
See http://forum.hauptwerk.com/viewtopic.php?f=10&t=17977
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