•The download will range between 2GB and 2.74GB depending on CPU architecture and language.
•Once the build is downloaded, your PC will begin the installation and reboot. This reboot will be longer than normal but don’t worry.
•When you log in for the first time after installing the new build, you’ll go through those colorful “installing your apps” screens again. This is because your account is being provisioned again. When it’s done it will be your same familiar system with all of your stuff.
•Once you are logged back in after installing the new build, your system will take some time to catch back up and you may see extra activity or things that don’t quite work right – for example the search index will need time to rebuild and OneDrive will need to sync. This should stabilize within the first couple hours of use.
Some known problems:

Before talking about the new things, I will remind you that you are using a work in progress. As Joe said in his last post, we’re sharing things with you even though there are rough edges. This is the part of building Windows that you usually don’t get to see, since we work hard to smooth these out before it typically gets to you. There are likely many small bugs that you’ll encounter, but these are a few of the big ones that we think you should be aware of right away:
•In some places the UI design has gone “backwards” temporarily while we’re working on the final experiences. For example in this build we know that it’s harder to join a Wi-Fi network. We’ll make changes to fix that later.
•Another example of some UI “roughness” is sometimes Internet Explorer glyphs look garbled and items on the Start menu might disappear. Not everyone will see this, it depends on your display driver. We have a fix for this one coming soon.
•Some machines may wake up and not go back to sleep properly.
•Microsoft Solitaire and Mahjong games are broken in some cases and won’t launch.
•When using 2 external monitors over Display Link, you may get a blue screen when you undock. This does not appear to be an issue when using just 1 external monitor. A fix for this one is in the works too.

You’ll notice once you install 9860 that there is a new option to set how quickly new builds reach you. In part, this change was also based on your feedback, as we heard from many of you that you’d like to know more about what issues you might run into before you install the build.