Downloaded successfully on hotel wifi. However, during installation, Bitlocker came up with the following screens.
(Sorry for the lousy pictures.)
I shut the computer off and went to dinner. Came back several hours later, and was able to use my recovery key to get into the drive. The update completed at that point, but I don't know what caused this. Computer seems to be running okay now, and once I get home tomorrow, and clean it, I'll check it again to see if anything's wrong.