Keybase-installer fails on Windows 8 with generic error message

I'm running Powershell in Admin mode on Windows 8.

``` bash
$ node --version
v0.10.35

$ npm --version
2.12.1

$ gpg --version
gpg (GnuPG) 2.0.28 (Gpg4Win 2.2.5)
libcrypt 1.6.3
```

The installer seems to have installed fine, but then this happens:

```
$ keybase-installer
info: Made temporary directory C:\Users\Carlos\AppData\Local\Temp\keybase_install1XZNwPHoCFXjhRkdfVwKWg
info: cleaning up tmpdir C:\Users\Carlos\AppData\Local\Temp\keybase_install1XZNwPHoCFXjhRkdfVwKWg
error: exit code 2
```

Start by reproducing keybase-installer in an elevated PowerShell session on Windows 8 with the reported Node.js, npm, and GnuPG versions. Investigate why the installer only reports exit code 2 after cleaning its temporary directory; done means identifying the underlying failure and replacing the generic message with actionable diagnostics or a confirmed fix.

Written by the indexing model from the issue text.