The message says "The downloaded copy of Google Chrome (64-bit Test) is not valid & can not be installed. This could be due to an incomplete download or other network issue. Please try running the updater again when complete."
It tries to download 2 "parts" that are 1629kb each. It fails after the second part.
There was an incorrect version listed in the updater database download that didn't match the hash. I've fixed the mismatch and it should be working now. Sorry for the inconvenience.
Sometimes, the impossible can become possible, if you're awesome!
Thank you for the quick fix.