The updated content is included as a free expansion for the original game, which has had it's title updated to match.
Price comparison
GAMIVO INVERSUS Deluxe Global
€1,38
K4G INVERSUS Deluxe Steam CD Key -12%: GKC12OFF
€1,66 €1,46
Kinguin INVERSUS Deluxe Steam CD Key -5%: GKC5
€1,63 €1,55
eneba Inversus Deluxe
€1,89
eBay INVERSUS Deluxe
amazon INVERSUS Deluxe
INVERSUS Deluxe is available from 1.38 to 1.89 from 5 shops.