Old Contact Sheet plug in

I am still using CS5 - I own it, it works for me, and I no longer use it professionally so can't justify spending money on new version.  I use the File > Automate > Contact Sheet fairly often.  Not that it matters, but I generate contact sheets of all photos I've taken for the year and have them printed in a photo book as kind of a yearbook that is easier to browse, since I never print photos anymore.

Anyway - I recently got a new computer and I've moved over all my actions/shapes/fonts etc as best as I could.  One thing I am missing is the Contact Sheet that was found under the Automate menu.  I remember it being a hassle and I had to download something years ago but I can't remember what it was.  I've found plenty of old discussions on it saying you need a plug in, but all the links are no longer working.

Does anyone know of a way to get the plug in anymore?  I am on a Windows 11 machine.  Or, the name of the file and/or where it's saved?  I'd rather just download a new one if possible, but I do still have access to my old computer to go get it if I knew where to look.