Path not set in Windows for GUI installation

Keybase GUI Version: 1.0.16-20160713110836+a1c00b3

I first installed the keybase GUI version on my computer that already had keybase installed on it. I was running command line keybase commands to try and enroll my other computer, as suggested in the GUI, but the commands wouldn't work. So I ran a keybase update figuring there was a further update. However, I quickly figured out that I was still using the "old" keybase, so two things here.

1. the old version of keybase should be uninstalled prior to installing GUI keybase. There's nothing in the instructions that this should happen, or instructions on HOW to make this happen
2. the path doesn't get set in Windows by the installation. This should be part of the installation package or the user should be told to set the path to the new installation directory and what that directory is

Thanks!

Start by reviewing the Windows GUI installation flow and the instructions for users who already have command-line Keybase installed. Reproduce the installation on Windows, then verify that the old version is handled and that the new installation directory is available on PATH.