The [introduction](https://developers.google.com/appengine/docs/go/gettingstarted/devenvironment) says:

> 
> Follow the instructions on the download page to install the SDK on
>  your computer.
> 
> 
> 

But the [download page](https://developers.google.com/appengine/downloads) has no any instructions about how to install and what to do next. Only links.

All I found is this link to [WindowsInstallation](https://code.google.com/p/googleappengine/wiki/WindowsInstallation):

> 
> Download and run the latest Windows installer from our downloads page
> 
> 
> 

Must Windows XP users use the installer? Can they just download the Linux version and unzip it? I'd like to have a portable version rather than one that installs EXEs and registry settings, etc.

Also I do not understand what exactly do I have to choose. There are:

1. Google App Engine SDK 1.7.7 (`.msi` file)
2. Google App Engine SDK for Go 1.7.7 (`.zip` file)

I've downloaded the second. Do I need to download and install the first too? Just adding the second to the PATH and develop is exactly what I want. Is this enough?