OK. iMac 2015 vintage, OS10.13, PPro 2020.
I work on a lot of projects from various Disney O&Os. They're starting to get into some wicked cool new cam technology (like the Sony FS7), which make great looking pictures if you use the right LUT.
Unfortunately, they show up on my system minus the proper LUT (or even a note that a specific LUT was applied). Now that I understand what's going on (and assuming I survive the pandemic...), I'll ask for the LUTs in the future.
For the time being, I went to the Sony website and downloaded 4 general-purpose LUTs for the FS7. I followed the instructions below, creating a "LUTs/Technical" and a "LUTs/Creative" folder within the "Comon" folder; dropped the LUTs into the Technical folder; and VOILA!, they now appear in the "Basic" dropdown in Lumetri.
Score one for the home team!