Contact asknet support and request a refund. Tell them that you bought the wrong upgrade: https://steinberg.support-asknet.com/en/support/solutions
The upgrade you were supposed to buy is the upgrade from Absolute 2 to 3. You’ll get both Halion 6 and Halion Sonic 3 with it: https://www.steinberg.net/en/shop/buy_product/product/absolute-3-vst-instrument-collection.html