Installing Vagrant is extremely easy. Head over to the Vagrant downloads page and get the appropriate installer or package for your platform. Install the package using standard procedures for your operating system. The installer will automatically add vagrant to your system path so that it is available in terminals.
You can install downloaded box using this command
vagrant box add laravel/homestead path/to/your/box/file.box
Source: https://laracasts.com/forum/?p=1615-laravel-vagrant-homestead/0
I am able to run this command on win7:
box add homestead file:///c:/homestead.box
Also this one is working:
box add homestead file:///c:\homestead.box
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