I'm on the alpha channel for updates in V10 and there is a bug (still present when I tried to update to V188.8.131.52 today from 10.0.13.0) that freezes on the "updating TheBrain" box after download. It has been the same for all the latest alpha/beta after my initial install of TB 10 alpha. You have to close the "update TB Window" as there is no way to cancel.
The download is completed, I can find it in \users\my account\appdata\local\temp\TheBrain\Updates.
TB V10.0.14.0 running in a Windows 10 Pro x64 Build 1803 VM (Parallels 13) in Mac OS V10.14 (Mojave Public release). Host is a 2018 MBP 13" with 16Gb of RAM, 2TB SSD and i7 @ 2.7Ghz. Win VM has 8GB and 2 cores available, Mac Host has 8GB of RAM and 2 cores available.
If I start the update file manually, it updates fine.
Others have had the same issue, so it's not specific to my setup (see detailed config in sig).