Answer my own question . . .
In what I thought was an unrelated thread, I found the answer. I downloaded a new version of Ubisoft Game Launcher Installer, uninstalled the version that came with the DVD, and installed the new version. After that (and a few error messages along the way), SH5 now runs fine. I was able to install TWOS, which happened exactly as described in the TWOS installation guide.
Now to start a campaign!
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