For your information:
I have written to support about this and got the following response:
Hello,
I've just check that issue with our tech team, and I can assure you that the work is still in progress, however because this game is really hard to fix it will took more time - I'm talking here about couple of months of work at least. But let me assure you once more that we are not trying to sit it out and doing everything we can to make that game work properly as soon as possible.
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Regards
JuriJ
GOG.com Support
I asked for permission to post this on the forums and got this response.
Hello,
All we can promise that we are working on it and that we haven't abandoned that game. We cannot guarantee any deadlines. So you are free to post those information but only with information that I have wrote now.
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Regards
JuriJ
GOG.com Support