CROSSGRADE AND PRESONUS SPHERE

Hello!
I have a question which probably only the admin can answer…
I have bought PRESONUS SPHERE , which is a subscription that includes Presonus Studio One Pro and literary everything (ALL) that the presonus store
has to offer. And while i’m super satisfied with presonus am thinking of cubase as presonus sprere is an ongoing subscription while cubase pro an one time buy. IS THERE A CROSSGRADE OPTION BETWEEN CUBASE AND PRESONUS SHRERE as the latter includes STUDIO ONE PRO 5???
please, admin, help!

No. https://new.steinberg.net/cubase/?buy=48165