Prior to v2, we had been using a cmd file along with wget, but in hopes to make installing Chocolatey even easier, we switched to a ps1 script. This enables us to install Chocolatey quickly.
You don't need to download these files, you can simply install with the command:
iwr choco.run | iexchoco.run redirects to the latest code-signed release of install.ps1
alt.choco.run redirects to the latest code-signed release of install.ps1
See README for details.