I downloaded macOS 10.13.1 Beta 2 two times but it isn't installing Last night, I wanted to upgrade my system, so I downloaded macOS 10.13.1 Beta 2, but after downloading 2 GB files, it didn't do anything. I waited 10 mins but it was still the same, on App Store it just says "Update". 

So I downloaded it again with press Update button, and it downloaded 2 GB again. But still it is just saying "Update". It didn't restart, didn't open the installer or anything. 

What should I do?
In this case, the updater downloads to your Applications folder.  There you will see an icon there that you can click on to update.

You can use Launchpad to see the icon, or go directly to your Applications folder.