It sounds fair, that daz will upgrade all users that bought the ds4 pro with real money and didn’t go for a refunds.
give a free update to the final dazstudio 5 ProPro user
and give the normal pro 4.5 version (standard version) for free to all who download the free version and some option to those people to update at special price.
that sounds fair for all people that lost money!
Couple issues with your line of reasoning.
I don’t see them making up new features for a PROPRO version. And if they took away features from the PRO version so the PROPRO was somehow better why would free users upgrade to a more restricted version?