Vblank released 1.52 update few days ago on Steam, and they stated that GOG version will receive it too, but it's up to GOG staff to release it (https://twitter.com/RetroCR/status/556765558549778433).

So... any ideas when will it be available? I know, this patch only improves performance and reduces file sizes, but, anyway, would be glad to see it as soon as possible.