Upgrade from Wavelab Studio 6?

I’ve not upgraded Wavelab since I originally purchased it 6 or 7 years ago, but it’s definitely time. I own Wavelab Studio 6, but I don’t see any upgrade path from Studio 6, only upgrade pricing from Essentials 6 or the full Wavelab 6. Is there no upgrade pricing at all from Wavelab Studio 6 to either Elements 8 or Wavelab 8.5?

I’d hate to have to pay full price again…anyone know about this?