“The owner of this file has been blocked.”

So unfortunately, not just Caslon is inaccessible, but also the subsequent very fascinating P22 1722 font that the user posted.

With significant modifications under the hood (massive Registry changes for the Windows Explorer folder tree to simplify it back to rational XP standards... no libraries, nothing except for the hard drive folder tree) and a replacement start menu (StartIsBack, because Open-Shell isn’t working for Win11 yet), and Win11 is actually working quite well for my Octogenarian father. And he’s of the age where change comes very badly for him, which is why I needed to make some serious open-heart surgery on Win11 to modify things back to an XP look-and-feel. But it is doable, it just takes some time and occasional maintenance to ensure it stays usable.