Originally Posted by Piran Jade
But the save games that you make with your Steam version are compatible with the GOG version, so once we're done (which I hope is today), you'll be able to make transition smoothly. We prioritised the people who didn't use their Steam key as we figured that if people were already playing on Steam, it wouldn't be that much of a problem to wait a few more days.
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I have specifically not been using my current steam key because there was no way to be sure of this. GOG.com can often be behind multiple patches.