Some Windows 10 users see the problem where the app is uninstalled or removed while it is auto-updating. This happens only when the app is installed for all users on the machine. If you go with the default option of installing for just the current user, this problem doesn’t happen.
We have yet to identify the bug, but this is a workaround.
So if your app was uninstalled by itself while auto-updating, download the latest copy from here and install it again. But this time, go with the default as shown in the image below.