Upgrade amount

The existing license is version 7, and if you skip version 8 and upgrade when version 9 is released, what is the cost policy?
Is it the same at 8 or 9?

I believe upgrading to Rhino 9 will be the same price regardless from what version you upgrade (say Rhino 5).

Note though that in all likelihood it will be many, many more years before Rhino 9 gets out. You’ll probably miss out on a lot of progress. Besides, upgrading to Rhino 8 when it comes out will give you access to Rhino 9 WIP.