Open a terminal on your computer then:
mkdir msbx5420vagrant
cd msbx5420vagrant
curl -O https://raw.githubusercontent.com/sstirlin/MSBX5420Spring2019/master/Vagrantfile
vagrant plugin install vagrant-disksize
vagrant up
To start over and recreate your VM :
vagrant destroy
curl -O https://raw.githubusercontent.com/sstirlin/MSBX5420Spring2019/master/Vagrantfile
vagrant plugin install vagrant-disksize
vagrant up