Okay so after that uninstalling of individual components and their dependents finished, I did what you said and it just started up Visual Studio Installer (which I already had open before).
4.6.2 is not listed, 4.6, 4.6.1, and 4.7+ are listed, but not 4.6.2 so I’m going to try that installer I downloaded again, now that ALL the other versions are removed.
…aaaand the installer STILL says
.NET Framework 4.6.2 or a later update is already installed on this computer.
After removing ALL the versions in both Visual Studio Build Tools 2017 (2)
15.9.15 and Visual Studio Community 2017 15.9.15
Where else can I look to uninstall this mysterious thing so the installer for 4.6.2 I downloaded will let me install it?