Discovered Spectral Layers 10 Pro Today-Crossgrade Pricing

I see on the Steinberg products website that I’ll save $100. with a crossgrade purchase.

I have Izotope RX 5 Advanced, which I haven’t used since my old laptop died long ago. If I go to Native Instruments-which merged with Izotope-and can retrieve my license what else do I need to get the crossgrade price on Spectral Layers 10 pro?

Screenshots of your native instrument account showing the RX license, preferably with a serial number and/or date of purchase is likely going to be enough of a proof. Or the confirmation email when you bought your RX license.