Need help adding a footprint resource to old (abandoned?) cc

I stumbled across some quite old cc, a bed recolor from the single Metal-Framed bed from Parenthood. You can get the original package from here: kymscreationz.blogspot.com/search?updated-max=2017-11-07T10:02:00-08:00&max-results=7&start=7&by-date=false, and when I try to place it in-game, I get an error message "no footprint resource". Digging around the internet, I found that means I'm usually missing the base mesh, similar to how hair recolors work--distribute the recolors, but you download the mesh from elsewhere. But the creator's site doesn't list any other requirements besides the pack and the base game. I did find an old 2016 tutorial about how to add a footprint to a mesh, but the layout of S4S seems to have changed over the years to where that tutorial is no longer quite as helpful, and trying to batch export/re-import the Footprint file from the Parenthood bed into the recolored package just gave me a messy error message.

I think I've done about as much as I can on my own; anyone else have any suggestions? Am I missing something obvious here?