Didn't lose power, just went to work. Came back the next day, and...

H2017.06.06.0000.0001x (x changes depending on download)

...starts downloading. It failed to download once, and I had to start over.
It acts like the launcher doesn't recognize the files, so it redownloads a different version. I've seen it up to "i", but not sure if it's a generated numeric or a static, separate file. It's not a issue our side, fortunately - has to be a launcher glitch.