Unmix stems?

Where is the Unmix Stems process??
Could we get a video, please?

Layer > Unmix Stems

Here’s the doc, with 2 links to videos:
https://download.steinberg.net/downloads_software/SpectraLayers_9/help/Pro/_unmixing_layers.html

(if you can’t see Unmix Stems it means you didn’t activate your Pro license in the Steinberg Activation Manager)

The Activation Manager… DUH !! Thank you !!