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Blood Omen has it's own GOG forum seperate from the rest of the series. I see no reason for it not to be included here.
Blood Omen was created by Silicon Knights, not Eidos. That could be the reason, but nobody knows for sure.
could be because it took blood omen ages to actually appear on the store,and for some reason the GOG team didn't bother adding it to this list.

last time I checked, silicon knights havent owned blood omen in over 20 years, so this game should have been a Eidos/Crystal Dynamics product like the rest of the games