Ozone 11 Advanced Crossgrade

but seem to be not able to use that crossgrade price. Did I miss anything?

What you most likely are missing is that the yellow exclamation point shown below is 'cosmetic' only and only serves as a warning to make sure that you check your own eligibility prior to purchasing. If you qualify you qualify , the exclamation just means check before you buy ! . Ref. https://www.native-instruments.com/en/pricing/ozone-11-advanced/