`vagrant up` not from command line?

[zogstrip (Régis Hanol)]

My question is: How can I download that .box file and complete all tasks that vagrant up does without using cmd?

1. Download http://discourse-vms.s3.amazonaws.com/discourse-1.3.0.box
2. Run vagrant box add discourse-1.3.0 /path/to/the/downloaded/discourse-1.3.0.box