It would seem that I will need to create my own profiles, which means obtaining calibration targets, taking precise photos of them, and using yet another Adobe application, lens profile creator. The downloader has a link to log in, which doesn't work. The Adobe software is unreliable and unstable. As near as I can tell, the claims of support at your link do not exist.
If I switch to my brand of camera, Canon, I still do not see the profiles that your link link claims are available. Two, once I finally figured out that I needed to install the profile downloader, I discovered that almost none of the Sigmas listed at the link were available for download. One, that link neglects to tell you how to obtain the profiles.
Thanks for posting your link to "supported lenses", because that link is central to my issue. The default install of installation of LR6 only included four Sigmas, all of them extreme wide angle lenses. For example, I wanted profiles for my Sigma telephoto zoom. However, that was not the case when I began using LR6. Lightroom promised to provide those profiles, which your link would seem to suggest. My initial question was motivated by my using Lightroom 6, and not finding a lens profile for my third parry lenses.
After repeatedly installing AIR and trying to install the downloader program on three different machines, at three different locations, it suddenly woke up and installed on each machine. I don't know why your answer is marked correct.
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