micktiegs_8: made an important change to Hand of Fate regarding its DLC. Talked with the developer and long story short; I talked consumer rights, they say 'check, we're not in breach' and 'Screen Australia knows the difficulties of working with multiple platforms'. Also, 'ask GOG if you want a refund'.
If GOG manages to contact them for a more concrete answer, then I'll change my entry accordingly.
looked on Steam , and well :
a / gog last upate 1.2.12 , steam : 1.3.0 (patch 1.2.13 & 1.2.14 are MIA :S there)
b / no DLC atm on GOG (it's planned according to a dev , but the post is from august .....)
c / no soundtrack avaible either on GOG.
reasons mentionned by a dev : Steam comes first (update / dlc etc...) because they are a small team..
i won't post any personal comment, except GOG should contact them (if not done yet)
I just hope the dlc will come with the 1.3.0 patch (which seems a larger one)