Upgrade to HZD Remastered on Epic

Hi, I heard it's possible to upgrade existing HZD Complete to Remastered on Epic, but I don't know how.

I searched for Remastered and I see it with price lowered by 81% (about 10$), but when I try to buy it I get a warning that I already own the game, so am I sure I want to buy it.

Should I go through with buying this (heavily discounted) version?